KILLED
proof of input_LOExWCmMrO.trs
# AProVE Commit ID: aff8ecad908e01718a4c36e68d2e55d5e0f16e15 fuhs 20220216 unpublished


The Runtime Complexity (parallel-innermost) of the given CpxTRS could be proven to be BOUNDS(1, INF).

(0) CpxTRS
(1) RenamingProof [BOTH BOUNDS(ID, ID), 0 ms]
(2) CpxTRS
(3) RelTrsToTrsProof [UPPER BOUND(ID), 0 ms]
(4) CpxTRS
(5) RelTrsToWeightedTrsProof [UPPER BOUND(ID), 0 ms]
(6) CpxWeightedTrs
    (7) TypeInferenceProof [BOTH BOUNDS(ID, ID), 0 ms]
    (8) CpxTypedWeightedTrs
    (9) CompletionProof [UPPER BOUND(ID), 0 ms]
    (10) CpxTypedWeightedCompleteTrs
        (11) NarrowingProof [BOTH BOUNDS(ID, ID), 31 ms]
        (12) CpxTypedWeightedCompleteTrs
        (13) CpxTypedWeightedTrsToRntsProof [UPPER BOUND(ID), 0 ms]
        (14) CpxRNTS
        (15) SimplificationProof [BOTH BOUNDS(ID, ID), 0 ms]
        (16) CpxRNTS
    (17) CompletionProof [UPPER BOUND(ID), 0 ms]
    (18) CpxTypedWeightedCompleteTrs
        (19) CpxTypedWeightedTrsToRntsProof [UPPER BOUND(ID), 0 ms]
        (20) CpxRNTS
(21) CpxTrsToCdtProof [UPPER BOUND(ID), 0 ms]
(22) CdtProblem
    (23) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (24) CdtProblem
    (25) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 1 ms]
    (26) CdtProblem
    (27) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (28) CdtProblem
    (29) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (30) CdtProblem
    (31) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 0 ms]
    (32) CdtProblem
    (33) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (34) CdtProblem
    (35) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (36) CdtProblem
    (37) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 0 ms]
    (38) CdtProblem
    (39) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (40) CdtProblem
    (41) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (42) CdtProblem
    (43) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 0 ms]
    (44) CdtProblem
    (45) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (46) CdtProblem
    (47) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (48) CdtProblem
    (49) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 18 ms]
    (50) CdtProblem
    (51) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (52) CdtProblem
    (53) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (54) CdtProblem
    (55) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 38 ms]
    (56) CdtProblem
    (57) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (58) CdtProblem
    (59) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (60) CdtProblem
    (61) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 0 ms]
    (62) CdtProblem
    (63) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (64) CdtProblem
    (65) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (66) CdtProblem
    (67) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 30 ms]
    (68) CdtProblem
    (69) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (70) CdtProblem
    (71) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (72) CdtProblem
    (73) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 31 ms]
    (74) CdtProblem
    (75) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (76) CdtProblem
    (77) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (78) CdtProblem
    (79) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 39 ms]
    (80) CdtProblem
    (81) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (82) CdtProblem
    (83) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (84) CdtProblem
    (85) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 13 ms]
    (86) CdtProblem
    (87) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (88) CdtProblem
    (89) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 48 ms]
    (90) CdtProblem
    (91) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (92) CdtProblem
    (93) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 63 ms]
    (94) CdtProblem
    (95) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (96) CdtProblem
    (97) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 12 ms]
    (98) CdtProblem
    (99) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 8 ms]
    (100) CdtProblem
    (101) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 5 ms]
    (102) CdtProblem
    (103) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (104) CdtProblem
    (105) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 44 ms]
    (106) CdtProblem
    (107) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 19 ms]
    (108) CdtProblem
    (109) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 82 ms]
    (110) CdtProblem
    (111) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (112) CdtProblem
    (113) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 163 ms]
    (114) CdtProblem
    (115) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (116) CdtProblem
    (117) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 123 ms]
    (118) CdtProblem
    (119) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (120) CdtProblem
    (121) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 125 ms]
    (122) CdtProblem
    (123) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (124) CdtProblem
    (125) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (126) CdtProblem
    (127) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 127 ms]
    (128) CdtProblem
    (129) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 15 ms]
    (130) CdtProblem
    (131) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 33 ms]
    (132) CdtProblem
    (133) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 163 ms]
    (134) CdtProblem
    (135) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 34 ms]
    (136) CdtProblem
    (137) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 44 ms]
    (138) CdtProblem
    (139) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 119 ms]
    (140) CdtProblem
    (141) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (142) CdtProblem
    (143) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (144) CdtProblem
    (145) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 94 ms]
    (146) CdtProblem
    (147) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (148) CdtProblem
    (149) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (150) CdtProblem
    (151) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 42 ms]
    (152) CdtProblem
    (153) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (154) CdtProblem
    (155) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (156) CdtProblem
    (157) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 26 ms]
    (158) CdtProblem
    (159) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (160) CdtProblem
    (161) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (162) CdtProblem
    (163) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 47 ms]
    (164) CdtProblem
    (165) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 11 ms]
    (166) CdtProblem
    (167) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (168) CdtProblem
    (169) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 95 ms]
    (170) CdtProblem
    (171) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 0 ms]
    (172) CdtProblem
    (173) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 52 ms]
    (174) CdtProblem
    (175) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 46 ms]
    (176) CdtProblem
    (177) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (178) CdtProblem
    (179) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 169 ms]
    (180) CdtProblem
    (181) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 43 ms]
    (182) CdtProblem
    (183) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 72 ms]
    (184) CdtProblem
    (185) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (186) CdtProblem
    (187) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 96 ms]
    (188) CdtProblem
    (189) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 26 ms]
    (190) CdtProblem
    (191) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 81 ms]
    (192) CdtProblem
    (193) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (194) CdtProblem
    (195) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 144 ms]
    (196) CdtProblem
    (197) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (198) CdtProblem
    (199) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 126 ms]
    (200) CdtProblem
    (201) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 0 ms]
    (202) CdtProblem
    (203) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 124 ms]
    (204) CdtProblem
    (205) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 23 ms]
    (206) CdtProblem
    (207) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 206 ms]
    (208) CdtProblem
    (209) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 64 ms]
    (210) CdtProblem
    (211) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 79 ms]
    (212) CdtProblem
    (213) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 229 ms]
    (214) CdtProblem
    (215) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 55 ms]
    (216) CdtProblem
    (217) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 79 ms]
    (218) CdtProblem
    (219) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 200 ms]
    (220) CdtProblem
    (221) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 20 ms]
    (222) CdtProblem
    (223) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 70 ms]
    (224) CdtProblem
    (225) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 143 ms]
    (226) CdtProblem
    (227) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 19 ms]
    (228) CdtProblem
    (229) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 4 ms]
    (230) CdtProblem
    (231) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 275 ms]
    (232) CdtProblem
    (233) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 33 ms]
    (234) CdtProblem
    (235) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 101 ms]
    (236) CdtProblem
    (237) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 384 ms]
    (238) CdtProblem
    (239) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 99 ms]
    (240) CdtProblem
    (241) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 72 ms]
    (242) CdtProblem
    (243) CdtNarrowingProof [BOTH BOUNDS(ID, ID), 504 ms]
    (244) CdtProblem
    (245) CdtLeafRemovalProof [BOTH BOUNDS(ID, ID), 131 ms]
    (246) CdtProblem
    (247) CdtRhsSimplificationProcessorProof [BOTH BOUNDS(ID, ID), 114 ms]
    (248) CdtProblem


----------------------------------------

(0)
Obligation:
The Runtime Complexity (parallel-innermost) of the given CpxTRS could be proven to be BOUNDS(1, INF).


The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X)))
   a__first(0, Z) -> nil
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z))
   a__sel(0, cons(X, Z)) -> mark(X)
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z))
   mark(from(X)) -> a__from(mark(X))
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2))
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
   mark(cons(X1, X2)) -> cons(mark(X1), X2)
   mark(s(X)) -> s(mark(X))
   mark(0) -> 0
   mark(nil) -> nil
   a__from(X) -> from(X)
   a__first(X1, X2) -> first(X1, X2)
   a__sel(X1, X2) -> sel(X1, X2)

S is empty.
Rewrite Strategy: PARALLEL_INNERMOST
----------------------------------------

(1) RenamingProof (BOTH BOUNDS(ID, ID))
Renamed function symbols to avoid clashes with predefined symbol.
----------------------------------------

(2)
Obligation:
The Runtime Complexity (parallel-innermost) of the given CpxTRS could be proven to be BOUNDS(1, INF).


The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X)))
   a__first(0', Z) -> nil
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z))
   a__sel(0', cons(X, Z)) -> mark(X)
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z))
   mark(from(X)) -> a__from(mark(X))
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2))
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
   mark(cons(X1, X2)) -> cons(mark(X1), X2)
   mark(s(X)) -> s(mark(X))
   mark(0') -> 0'
   mark(nil) -> nil
   a__from(X) -> from(X)
   a__first(X1, X2) -> first(X1, X2)
   a__sel(X1, X2) -> sel(X1, X2)

S is empty.
Rewrite Strategy: PARALLEL_INNERMOST
----------------------------------------

(3) RelTrsToTrsProof (UPPER BOUND(ID))
transformed relative TRS to TRS
----------------------------------------

(4)
Obligation:
The Runtime Complexity (parallel-innermost) of the given CpxTRS could be proven to be BOUNDS(1, INF).


The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X)))
   a__first(0, Z) -> nil
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z))
   a__sel(0, cons(X, Z)) -> mark(X)
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z))
   mark(from(X)) -> a__from(mark(X))
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2))
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
   mark(cons(X1, X2)) -> cons(mark(X1), X2)
   mark(s(X)) -> s(mark(X))
   mark(0) -> 0
   mark(nil) -> nil
   a__from(X) -> from(X)
   a__first(X1, X2) -> first(X1, X2)
   a__sel(X1, X2) -> sel(X1, X2)

S is empty.
Rewrite Strategy: PARALLEL_INNERMOST
----------------------------------------

(5) RelTrsToWeightedTrsProof (UPPER BOUND(ID))
Transformed relative TRS to weighted TRS
----------------------------------------

(6)
Obligation:
The Runtime Complexity (innermost) of the given CpxWeightedTrs could be proven to be BOUNDS(1, INF).


The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X))) [1]
   a__first(0, Z) -> nil [1]
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z)) [1]
   a__sel(0, cons(X, Z)) -> mark(X) [1]
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z)) [1]
   mark(from(X)) -> a__from(mark(X)) [1]
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2)) [1]
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2)) [1]
   mark(cons(X1, X2)) -> cons(mark(X1), X2) [1]
   mark(s(X)) -> s(mark(X)) [1]
   mark(0) -> 0 [1]
   mark(nil) -> nil [1]
   a__from(X) -> from(X) [1]
   a__first(X1, X2) -> first(X1, X2) [1]
   a__sel(X1, X2) -> sel(X1, X2) [1]

Rewrite Strategy: INNERMOST
----------------------------------------

(7) TypeInferenceProof (BOTH BOUNDS(ID, ID))
Infered types.
----------------------------------------

(8)
Obligation:
Runtime Complexity Weighted TRS with Types.
The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X))) [1]
   a__first(0, Z) -> nil [1]
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z)) [1]
   a__sel(0, cons(X, Z)) -> mark(X) [1]
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z)) [1]
   mark(from(X)) -> a__from(mark(X)) [1]
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2)) [1]
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2)) [1]
   mark(cons(X1, X2)) -> cons(mark(X1), X2) [1]
   mark(s(X)) -> s(mark(X)) [1]
   mark(0) -> 0 [1]
   mark(nil) -> nil [1]
   a__from(X) -> from(X) [1]
   a__first(X1, X2) -> first(X1, X2) [1]
   a__sel(X1, X2) -> sel(X1, X2) [1]

The TRS has the following type information:
a__from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
cons :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
mark :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
s :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
0 :: s:from:cons:0:nil:first:sel
nil :: s:from:cons:0:nil:first:sel
first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel

Rewrite Strategy: INNERMOST
----------------------------------------

(9) CompletionProof (UPPER BOUND(ID))
The transformation into a RNTS is sound, since:

(a) The obligation is a constructor system where every type has a constant constructor,

(b) The following defined symbols do not have to be completely defined, as they can never occur inside other defined symbols:
none

(c) The following functions are completely defined:

   mark_1
   a__sel_2
   a__from_1
   a__first_2

Due to the following rules being added:
none

And the following fresh constants: none

----------------------------------------

(10)
Obligation:
Runtime Complexity Weighted TRS where critical functions are completely defined. The underlying TRS is:

Runtime Complexity Weighted TRS with Types.
The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X))) [1]
   a__first(0, Z) -> nil [1]
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z)) [1]
   a__sel(0, cons(X, Z)) -> mark(X) [1]
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z)) [1]
   mark(from(X)) -> a__from(mark(X)) [1]
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2)) [1]
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2)) [1]
   mark(cons(X1, X2)) -> cons(mark(X1), X2) [1]
   mark(s(X)) -> s(mark(X)) [1]
   mark(0) -> 0 [1]
   mark(nil) -> nil [1]
   a__from(X) -> from(X) [1]
   a__first(X1, X2) -> first(X1, X2) [1]
   a__sel(X1, X2) -> sel(X1, X2) [1]

The TRS has the following type information:
a__from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
cons :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
mark :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
s :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
0 :: s:from:cons:0:nil:first:sel
nil :: s:from:cons:0:nil:first:sel
first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel

Rewrite Strategy: INNERMOST
----------------------------------------

(11) NarrowingProof (BOTH BOUNDS(ID, ID))
Narrowed the inner basic terms of all right-hand sides by a single narrowing step.
----------------------------------------

(12)
Obligation:
Runtime Complexity Weighted TRS where critical functions are completely defined. The underlying TRS is:

Runtime Complexity Weighted TRS with Types.
The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X))) [1]
   a__first(0, Z) -> nil [1]
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z)) [1]
   a__sel(0, cons(X, Z)) -> mark(X) [1]
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z)) [1]
   mark(from(from(X35))) -> a__from(a__from(mark(X35))) [2]
   mark(from(first(X123, X223))) -> a__from(a__first(mark(X123), mark(X223))) [2]
   mark(from(sel(X124, X224))) -> a__from(a__sel(mark(X124), mark(X224))) [2]
   mark(from(cons(X125, X225))) -> a__from(cons(mark(X125), X225)) [2]
   mark(from(s(X36))) -> a__from(s(mark(X36))) [2]
   mark(from(0)) -> a__from(0) [2]
   mark(from(nil)) -> a__from(nil) [2]
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2)) [1]
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2)) [1]
   mark(cons(X1, X2)) -> cons(mark(X1), X2) [1]
   mark(s(X)) -> s(mark(X)) [1]
   mark(0) -> 0 [1]
   mark(nil) -> nil [1]
   a__from(X) -> from(X) [1]
   a__first(X1, X2) -> first(X1, X2) [1]
   a__sel(X1, X2) -> sel(X1, X2) [1]

The TRS has the following type information:
a__from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
cons :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
mark :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
s :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
0 :: s:from:cons:0:nil:first:sel
nil :: s:from:cons:0:nil:first:sel
first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel

Rewrite Strategy: INNERMOST
----------------------------------------

(13) CpxTypedWeightedTrsToRntsProof (UPPER BOUND(ID))
Transformed the TRS into an over-approximating RNTS by (improved) Size Abstraction.
The constant constructors are abstracted as follows:

   0 => 0
   nil => 1

----------------------------------------

(14)
Obligation:
Complexity RNTS consisting of the following rules:

   a__first(z, z') -{ 1 }-> 1 :|: Z >= 0, z' = Z, z = 0
   a__first(z, z') -{ 1 }-> 1 + X1 + X2 :|: X1 >= 0, X2 >= 0, z = X1, z' = X2
   a__first(z, z') -{ 1 }-> 1 + mark(Y) + (1 + X + Z) :|: Z >= 0, z = 1 + X, Y >= 0, X >= 0, z' = 1 + Y + Z
   a__from(z) -{ 1 }-> 1 + X :|: X >= 0, z = X
   a__from(z) -{ 1 }-> 1 + mark(X) + (1 + (1 + X)) :|: X >= 0, z = X
   a__sel(z, z') -{ 1 }-> mark(X) :|: Z >= 0, X >= 0, z = 0, z' = 1 + X + Z
   a__sel(z, z') -{ 1 }-> a__sel(mark(X), mark(Z)) :|: Z >= 0, z = 1 + X, Y >= 0, X >= 0, z' = 1 + Y + Z
   a__sel(z, z') -{ 1 }-> 1 + X1 + X2 :|: X1 >= 0, X2 >= 0, z = X1, z' = X2
   mark(z) -{ 1 }-> a__sel(mark(X1), mark(X2)) :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2
   mark(z) -{ 2 }-> a__from(a__sel(mark(X124), mark(X224))) :|: X124 >= 0, X224 >= 0, z = 1 + (1 + X124 + X224)
   mark(z) -{ 2 }-> a__from(a__from(mark(X35))) :|: z = 1 + (1 + X35), X35 >= 0
   mark(z) -{ 2 }-> a__from(a__first(mark(X123), mark(X223))) :|: X223 >= 0, z = 1 + (1 + X123 + X223), X123 >= 0
   mark(z) -{ 2 }-> a__from(1) :|: z = 1 + 1
   mark(z) -{ 2 }-> a__from(0) :|: z = 1 + 0
   mark(z) -{ 2 }-> a__from(1 + mark(X36)) :|: X36 >= 0, z = 1 + (1 + X36)
   mark(z) -{ 2 }-> a__from(1 + mark(X125) + X225) :|: X125 >= 0, X225 >= 0, z = 1 + (1 + X125 + X225)
   mark(z) -{ 1 }-> a__first(mark(X1), mark(X2)) :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2
   mark(z) -{ 1 }-> 1 :|: z = 1
   mark(z) -{ 1 }-> 0 :|: z = 0
   mark(z) -{ 1 }-> 1 + mark(X) :|: z = 1 + X, X >= 0
   mark(z) -{ 1 }-> 1 + mark(X1) + X2 :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2


----------------------------------------

(15) SimplificationProof (BOTH BOUNDS(ID, ID))
Simplified the RNTS by moving equalities from the constraints into the right-hand sides.
----------------------------------------

(16)
Obligation:
Complexity RNTS consisting of the following rules:

   a__first(z, z') -{ 1 }-> 1 :|: z' >= 0, z = 0
   a__first(z, z') -{ 1 }-> 1 + z + z' :|: z >= 0, z' >= 0
   a__first(z, z') -{ 1 }-> 1 + mark(Y) + (1 + (z - 1) + Z) :|: Z >= 0, Y >= 0, z - 1 >= 0, z' = 1 + Y + Z
   a__from(z) -{ 1 }-> 1 + z :|: z >= 0
   a__from(z) -{ 1 }-> 1 + mark(z) + (1 + (1 + z)) :|: z >= 0
   a__sel(z, z') -{ 1 }-> mark(X) :|: Z >= 0, X >= 0, z = 0, z' = 1 + X + Z
   a__sel(z, z') -{ 1 }-> a__sel(mark(z - 1), mark(Z)) :|: Z >= 0, Y >= 0, z - 1 >= 0, z' = 1 + Y + Z
   a__sel(z, z') -{ 1 }-> 1 + z + z' :|: z >= 0, z' >= 0
   mark(z) -{ 1 }-> a__sel(mark(X1), mark(X2)) :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2
   mark(z) -{ 2 }-> a__from(a__sel(mark(X124), mark(X224))) :|: X124 >= 0, X224 >= 0, z = 1 + (1 + X124 + X224)
   mark(z) -{ 2 }-> a__from(a__from(mark(z - 2))) :|: z - 2 >= 0
   mark(z) -{ 2 }-> a__from(a__first(mark(X123), mark(X223))) :|: X223 >= 0, z = 1 + (1 + X123 + X223), X123 >= 0
   mark(z) -{ 2 }-> a__from(1) :|: z = 1 + 1
   mark(z) -{ 2 }-> a__from(0) :|: z = 1 + 0
   mark(z) -{ 2 }-> a__from(1 + mark(z - 2)) :|: z - 2 >= 0
   mark(z) -{ 2 }-> a__from(1 + mark(X125) + X225) :|: X125 >= 0, X225 >= 0, z = 1 + (1 + X125 + X225)
   mark(z) -{ 1 }-> a__first(mark(X1), mark(X2)) :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2
   mark(z) -{ 1 }-> 1 :|: z = 1
   mark(z) -{ 1 }-> 0 :|: z = 0
   mark(z) -{ 1 }-> 1 + mark(z - 1) :|: z - 1 >= 0
   mark(z) -{ 1 }-> 1 + mark(X1) + X2 :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2


----------------------------------------

(17) CompletionProof (UPPER BOUND(ID))
The TRS is a completely defined constructor system, as every type has a constant constructor and the following rules were added:
none

And the following fresh constants: none

----------------------------------------

(18)
Obligation:
Runtime Complexity Weighted TRS where all functions are completely defined. The underlying TRS is:

Runtime Complexity Weighted TRS with Types.
The TRS R consists of the following rules:

   a__from(X) -> cons(mark(X), from(s(X))) [1]
   a__first(0, Z) -> nil [1]
   a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z)) [1]
   a__sel(0, cons(X, Z)) -> mark(X) [1]
   a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z)) [1]
   mark(from(X)) -> a__from(mark(X)) [1]
   mark(first(X1, X2)) -> a__first(mark(X1), mark(X2)) [1]
   mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2)) [1]
   mark(cons(X1, X2)) -> cons(mark(X1), X2) [1]
   mark(s(X)) -> s(mark(X)) [1]
   mark(0) -> 0 [1]
   mark(nil) -> nil [1]
   a__from(X) -> from(X) [1]
   a__first(X1, X2) -> first(X1, X2) [1]
   a__sel(X1, X2) -> sel(X1, X2) [1]

The TRS has the following type information:
a__from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
cons :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
mark :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
from :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
s :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
0 :: s:from:cons:0:nil:first:sel
nil :: s:from:cons:0:nil:first:sel
first :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
a__sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel
sel :: s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel -> s:from:cons:0:nil:first:sel

Rewrite Strategy: INNERMOST
----------------------------------------

(19) CpxTypedWeightedTrsToRntsProof (UPPER BOUND(ID))
Transformed the TRS into an over-approximating RNTS by (improved) Size Abstraction.
The constant constructors are abstracted as follows:

   0 => 0
   nil => 1

----------------------------------------

(20)
Obligation:
Complexity RNTS consisting of the following rules:

   a__first(z, z') -{ 1 }-> 1 :|: Z >= 0, z' = Z, z = 0
   a__first(z, z') -{ 1 }-> 1 + X1 + X2 :|: X1 >= 0, X2 >= 0, z = X1, z' = X2
   a__first(z, z') -{ 1 }-> 1 + mark(Y) + (1 + X + Z) :|: Z >= 0, z = 1 + X, Y >= 0, X >= 0, z' = 1 + Y + Z
   a__from(z) -{ 1 }-> 1 + X :|: X >= 0, z = X
   a__from(z) -{ 1 }-> 1 + mark(X) + (1 + (1 + X)) :|: X >= 0, z = X
   a__sel(z, z') -{ 1 }-> mark(X) :|: Z >= 0, X >= 0, z = 0, z' = 1 + X + Z
   a__sel(z, z') -{ 1 }-> a__sel(mark(X), mark(Z)) :|: Z >= 0, z = 1 + X, Y >= 0, X >= 0, z' = 1 + Y + Z
   a__sel(z, z') -{ 1 }-> 1 + X1 + X2 :|: X1 >= 0, X2 >= 0, z = X1, z' = X2
   mark(z) -{ 1 }-> a__sel(mark(X1), mark(X2)) :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2
   mark(z) -{ 1 }-> a__from(mark(X)) :|: z = 1 + X, X >= 0
   mark(z) -{ 1 }-> a__first(mark(X1), mark(X2)) :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2
   mark(z) -{ 1 }-> 1 :|: z = 1
   mark(z) -{ 1 }-> 0 :|: z = 0
   mark(z) -{ 1 }-> 1 + mark(X) :|: z = 1 + X, X >= 0
   mark(z) -{ 1 }-> 1 + mark(X1) + X2 :|: X1 >= 0, X2 >= 0, z = 1 + X1 + X2

Only complete derivations are relevant for the runtime complexity.

----------------------------------------

(21) CpxTrsToCdtProof (UPPER BOUND(ID))
Converted Cpx (relative) TRS with rewrite strategy PARALLEL_INNERMOST to CDT
----------------------------------------

(22)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FROM(z0) -> c1
   A__FIRST(0, z0) -> c2
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__FIRST(z0, z1) -> c4
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c6(A__SEL(mark(z0), mark(z2)), MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   A__SEL(z0, z1) -> c8
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   MARK(0) -> c16
   MARK(nil) -> c17
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FROM(z0) -> c1
   A__FIRST(0, z0) -> c2
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__FIRST(z0, z1) -> c4
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c6(A__SEL(mark(z0), mark(z2)), MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   A__SEL(z0, z1) -> c8
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   MARK(0) -> c16
   MARK(nil) -> c17
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c1, c2, c3_1, c4, c5_1, c6_2, c7_2, c8, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c16, c17


----------------------------------------

(23) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 6 trailing nodes:
   A__SEL(z0, z1) -> c8
   A__FIRST(0, z0) -> c2
   A__FROM(z0) -> c1
   MARK(0) -> c16
   A__FIRST(z0, z1) -> c4
   MARK(nil) -> c17

----------------------------------------

(24)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c6(A__SEL(mark(z0), mark(z2)), MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c6(A__SEL(mark(z0), mark(z2)), MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c6_2, c7_2, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1


----------------------------------------

(25) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(z0), cons(z1, z2)) -> c6(A__SEL(mark(z0), mark(z2)), MARK(z0)) by 
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(A__SEL(mark(x0), 0), MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(A__SEL(mark(x0), nil), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)), MARK(0))
   A__SEL(s(nil), cons(x1, x2)) -> c6(A__SEL(nil, mark(x2)), MARK(nil))

----------------------------------------

(26)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(A__SEL(mark(x0), 0), MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(A__SEL(mark(x0), nil), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)), MARK(0))
   A__SEL(s(nil), cons(x1, x2)) -> c6(A__SEL(nil, mark(x2)), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(A__SEL(mark(x0), 0), MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(A__SEL(mark(x0), nil), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)), MARK(0))
   A__SEL(s(nil), cons(x1, x2)) -> c6(A__SEL(nil, mark(x2)), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c7_2, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2


----------------------------------------

(27) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   A__SEL(s(nil), cons(x1, x2)) -> c6(A__SEL(nil, mark(x2)), MARK(nil))

----------------------------------------

(28)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(A__SEL(mark(x0), 0), MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(A__SEL(mark(x0), nil), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(A__SEL(mark(x0), 0), MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(A__SEL(mark(x0), nil), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c7_2, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2


----------------------------------------

(29) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 5 trailing tuple parts
----------------------------------------

(30)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c7_2, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1


----------------------------------------

(31) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(z0), cons(z1, z2)) -> c7(A__SEL(mark(z0), mark(z2)), MARK(z2)) by 
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, 0)) -> c7(A__SEL(mark(x0), 0), MARK(0))
   A__SEL(s(x0), cons(x1, nil)) -> c7(A__SEL(mark(x0), nil), MARK(nil))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(A__SEL(nil, mark(x2)), MARK(x2))

----------------------------------------

(32)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, 0)) -> c7(A__SEL(mark(x0), 0), MARK(0))
   A__SEL(s(x0), cons(x1, nil)) -> c7(A__SEL(mark(x0), nil), MARK(nil))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(A__SEL(nil, mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, 0)) -> c7(A__SEL(mark(x0), 0), MARK(0))
   A__SEL(s(x0), cons(x1, nil)) -> c7(A__SEL(mark(x0), nil), MARK(nil))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(A__SEL(nil, mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2


----------------------------------------

(33) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   A__SEL(s(x0), cons(x1, nil)) -> c7(A__SEL(mark(x0), nil), MARK(nil))
   A__SEL(s(x0), cons(x1, 0)) -> c7(A__SEL(mark(x0), 0), MARK(0))

----------------------------------------

(34)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(A__SEL(nil, mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(A__SEL(cons(mark(z0), z1), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(A__SEL(nil, mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2


----------------------------------------

(35) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(36)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c10_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1


----------------------------------------

(37) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(z0, z1)) -> c10(A__FIRST(mark(z0), mark(z1)), MARK(z0)) by 
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(x0, s(z0))) -> c10(A__FIRST(mark(x0), s(mark(z0))), MARK(x0))
   MARK(first(x0, 0)) -> c10(A__FIRST(mark(x0), 0), MARK(x0))
   MARK(first(x0, nil)) -> c10(A__FIRST(mark(x0), nil), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), x1)) -> c10(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(0, x1)) -> c10(A__FIRST(0, mark(x1)), MARK(0))
   MARK(first(nil, x1)) -> c10(A__FIRST(nil, mark(x1)), MARK(nil))

----------------------------------------

(38)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(x0, s(z0))) -> c10(A__FIRST(mark(x0), s(mark(z0))), MARK(x0))
   MARK(first(x0, 0)) -> c10(A__FIRST(mark(x0), 0), MARK(x0))
   MARK(first(x0, nil)) -> c10(A__FIRST(mark(x0), nil), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), x1)) -> c10(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(0, x1)) -> c10(A__FIRST(0, mark(x1)), MARK(0))
   MARK(first(nil, x1)) -> c10(A__FIRST(nil, mark(x1)), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(x0, s(z0))) -> c10(A__FIRST(mark(x0), s(mark(z0))), MARK(x0))
   MARK(first(x0, 0)) -> c10(A__FIRST(mark(x0), 0), MARK(x0))
   MARK(first(x0, nil)) -> c10(A__FIRST(mark(x0), nil), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), x1)) -> c10(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(0, x1)) -> c10(A__FIRST(0, mark(x1)), MARK(0))
   MARK(first(nil, x1)) -> c10(A__FIRST(nil, mark(x1)), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2


----------------------------------------

(39) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(0, x1)) -> c10(A__FIRST(0, mark(x1)), MARK(0))
   MARK(first(nil, x1)) -> c10(A__FIRST(nil, mark(x1)), MARK(nil))

----------------------------------------

(40)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(x0, s(z0))) -> c10(A__FIRST(mark(x0), s(mark(z0))), MARK(x0))
   MARK(first(x0, 0)) -> c10(A__FIRST(mark(x0), 0), MARK(x0))
   MARK(first(x0, nil)) -> c10(A__FIRST(mark(x0), nil), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), x1)) -> c10(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(x0, s(z0))) -> c10(A__FIRST(mark(x0), s(mark(z0))), MARK(x0))
   MARK(first(x0, 0)) -> c10(A__FIRST(mark(x0), 0), MARK(x0))
   MARK(first(x0, nil)) -> c10(A__FIRST(mark(x0), nil), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), x1)) -> c10(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2


----------------------------------------

(41) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(42)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c11_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1


----------------------------------------

(43) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(z0, z1)) -> c11(A__FIRST(mark(z0), mark(z1)), MARK(z1)) by 
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(A__FIRST(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(first(x0, 0)) -> c11(A__FIRST(mark(x0), 0), MARK(0))
   MARK(first(x0, nil)) -> c11(A__FIRST(mark(x0), nil), MARK(nil))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(cons(z0, z1), x1)) -> c11(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(0, x1)) -> c11(A__FIRST(0, mark(x1)), MARK(x1))
   MARK(first(nil, x1)) -> c11(A__FIRST(nil, mark(x1)), MARK(x1))

----------------------------------------

(44)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(A__FIRST(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(first(x0, 0)) -> c11(A__FIRST(mark(x0), 0), MARK(0))
   MARK(first(x0, nil)) -> c11(A__FIRST(mark(x0), nil), MARK(nil))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(cons(z0, z1), x1)) -> c11(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(0, x1)) -> c11(A__FIRST(0, mark(x1)), MARK(x1))
   MARK(first(nil, x1)) -> c11(A__FIRST(nil, mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(A__FIRST(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(first(x0, 0)) -> c11(A__FIRST(mark(x0), 0), MARK(0))
   MARK(first(x0, nil)) -> c11(A__FIRST(mark(x0), nil), MARK(nil))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(cons(z0, z1), x1)) -> c11(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(0, x1)) -> c11(A__FIRST(0, mark(x1)), MARK(x1))
   MARK(first(nil, x1)) -> c11(A__FIRST(nil, mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2


----------------------------------------

(45) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(x0, nil)) -> c11(A__FIRST(mark(x0), nil), MARK(nil))
   MARK(first(x0, 0)) -> c11(A__FIRST(mark(x0), 0), MARK(0))

----------------------------------------

(46)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(A__FIRST(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(cons(z0, z1), x1)) -> c11(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(0, x1)) -> c11(A__FIRST(0, mark(x1)), MARK(x1))
   MARK(first(nil, x1)) -> c11(A__FIRST(nil, mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(A__FIRST(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(cons(z0, z1), x1)) -> c11(A__FIRST(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(0, x1)) -> c11(A__FIRST(0, mark(x1)), MARK(x1))
   MARK(first(nil, x1)) -> c11(A__FIRST(nil, mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2


----------------------------------------

(47) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(48)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c12_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1


----------------------------------------

(49) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(sel(z0, z1)) -> c12(A__SEL(mark(z0), mark(z1)), MARK(z0)) by 
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(x0, s(z0))) -> c12(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   MARK(sel(x0, 0)) -> c12(A__SEL(mark(x0), 0), MARK(x0))
   MARK(sel(x0, nil)) -> c12(A__SEL(mark(x0), nil), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), x1)) -> c12(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)), MARK(0))
   MARK(sel(nil, x1)) -> c12(A__SEL(nil, mark(x1)), MARK(nil))

----------------------------------------

(50)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(x0, s(z0))) -> c12(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   MARK(sel(x0, 0)) -> c12(A__SEL(mark(x0), 0), MARK(x0))
   MARK(sel(x0, nil)) -> c12(A__SEL(mark(x0), nil), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), x1)) -> c12(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)), MARK(0))
   MARK(sel(nil, x1)) -> c12(A__SEL(nil, mark(x1)), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(x0, s(z0))) -> c12(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   MARK(sel(x0, 0)) -> c12(A__SEL(mark(x0), 0), MARK(x0))
   MARK(sel(x0, nil)) -> c12(A__SEL(mark(x0), nil), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), x1)) -> c12(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)), MARK(0))
   MARK(sel(nil, x1)) -> c12(A__SEL(nil, mark(x1)), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2


----------------------------------------

(51) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   MARK(sel(nil, x1)) -> c12(A__SEL(nil, mark(x1)), MARK(nil))

----------------------------------------

(52)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(x0, s(z0))) -> c12(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   MARK(sel(x0, 0)) -> c12(A__SEL(mark(x0), 0), MARK(x0))
   MARK(sel(x0, nil)) -> c12(A__SEL(mark(x0), nil), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), x1)) -> c12(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(x0, s(z0))) -> c12(A__SEL(mark(x0), s(mark(z0))), MARK(x0))
   MARK(sel(x0, 0)) -> c12(A__SEL(mark(x0), 0), MARK(x0))
   MARK(sel(x0, nil)) -> c12(A__SEL(mark(x0), nil), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), x1)) -> c12(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(cons(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2


----------------------------------------

(53) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 5 trailing tuple parts
----------------------------------------

(54)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c13_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1


----------------------------------------

(55) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(sel(z0, z1)) -> c13(A__SEL(mark(z0), mark(z1)), MARK(z1)) by 
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(x0, s(z0))) -> c13(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(sel(x0, 0)) -> c13(A__SEL(mark(x0), 0), MARK(0))
   MARK(sel(x0, nil)) -> c13(A__SEL(mark(x0), nil), MARK(nil))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(cons(z0, z1), x1)) -> c13(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(nil, x1)) -> c13(A__SEL(nil, mark(x1)), MARK(x1))

----------------------------------------

(56)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(x0, s(z0))) -> c13(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(sel(x0, 0)) -> c13(A__SEL(mark(x0), 0), MARK(0))
   MARK(sel(x0, nil)) -> c13(A__SEL(mark(x0), nil), MARK(nil))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(cons(z0, z1), x1)) -> c13(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(nil, x1)) -> c13(A__SEL(nil, mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(x0, s(z0))) -> c13(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(sel(x0, 0)) -> c13(A__SEL(mark(x0), 0), MARK(0))
   MARK(sel(x0, nil)) -> c13(A__SEL(mark(x0), nil), MARK(nil))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(cons(z0, z1), x1)) -> c13(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(nil, x1)) -> c13(A__SEL(nil, mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2


----------------------------------------

(57) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(sel(x0, nil)) -> c13(A__SEL(mark(x0), nil), MARK(nil))
   MARK(sel(x0, 0)) -> c13(A__SEL(mark(x0), 0), MARK(0))

----------------------------------------

(58)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(x0, s(z0))) -> c13(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(cons(z0, z1), x1)) -> c13(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(nil, x1)) -> c13(A__SEL(nil, mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(x0, s(z0))) -> c13(A__SEL(mark(x0), s(mark(z0))), MARK(s(z0)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(cons(z0, z1), x1)) -> c13(A__SEL(cons(mark(z0), z1), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(nil, x1)) -> c13(A__SEL(nil, mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2


----------------------------------------

(59) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(60)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(61) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, from(z0))) -> c6(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0)) by 
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), from(mark(x2))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))), MARK(0))
   A__SEL(s(nil), cons(x1, from(x2))) -> c6(A__SEL(nil, a__from(mark(x2))), MARK(nil))

----------------------------------------

(62)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), from(mark(x2))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))), MARK(0))
   A__SEL(s(nil), cons(x1, from(x2))) -> c6(A__SEL(nil, a__from(mark(x2))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), from(mark(x2))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))), MARK(0))
   A__SEL(s(nil), cons(x1, from(x2))) -> c6(A__SEL(nil, a__from(mark(x2))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(63) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   A__SEL(s(nil), cons(x1, from(x2))) -> c6(A__SEL(nil, a__from(mark(x2))), MARK(nil))

----------------------------------------

(64)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), from(mark(x2))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), from(mark(x2))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(65) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(66)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(67) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, first(z0, z1))) -> c6(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0)) by 
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(0))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c6(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(nil))

----------------------------------------

(68)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(0))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c6(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(0))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c6(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(69) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c6(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(nil))

----------------------------------------

(70)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(71) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(72)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(73) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c6(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0)) by 
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(0))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c6(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(nil))

----------------------------------------

(74)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(0))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c6(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(0))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c6(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(75) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c6(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(nil))

----------------------------------------

(76)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(77) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(78)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(79) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c6(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0)) by 
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)), MARK(0))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c6(A__SEL(nil, cons(mark(x2), x3)), MARK(nil))

----------------------------------------

(80)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)), MARK(0))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c6(A__SEL(nil, cons(mark(x2), x3)), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)), MARK(0))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c6(A__SEL(nil, cons(mark(x2), x3)), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(81) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c6(A__SEL(nil, cons(mark(x2), x3)), MARK(nil))

----------------------------------------

(82)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(83) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(84)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(85) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(from(z0)), cons(x1, x2)) -> c6(A__SEL(a__from(mark(z0)), mark(x2)), MARK(from(z0))) by 
   A__SEL(s(from(x0)), cons(x1, from(z0))) -> c6(A__SEL(a__from(mark(x0)), a__from(mark(z0))), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, first(z0, z1))) -> c6(A__SEL(a__from(mark(x0)), a__first(mark(z0), mark(z1))), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, sel(z0, z1))) -> c6(A__SEL(a__from(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, cons(z0, z1))) -> c6(A__SEL(a__from(mark(x0)), cons(mark(z0), z1)), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(A__SEL(a__from(mark(x0)), 0), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(A__SEL(a__from(mark(x0)), nil), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(A__SEL(from(mark(x0)), mark(x2)), MARK(from(x0)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))

----------------------------------------

(86)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(A__SEL(a__from(mark(x0)), 0), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(A__SEL(a__from(mark(x0)), nil), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(A__SEL(from(mark(x0)), mark(x2)), MARK(from(x0)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(A__SEL(a__from(mark(x0)), 0), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(A__SEL(a__from(mark(x0)), nil), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(A__SEL(from(mark(x0)), mark(x2)), MARK(from(x0)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(87) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 5 trailing tuple parts
----------------------------------------

(88)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(89) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(first(z0, z1))) by 
   A__SEL(s(first(x0, x1)), cons(x2, from(z0))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), a__from(mark(z0))), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, first(z0, z1))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, sel(z0, z1))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, cons(z0, z1))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(first(x0, x1)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))

----------------------------------------

(90)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(first(x0, x1)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(first(x0, x1)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(91) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(92)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
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   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
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   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(93) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(sel(z0, z1))) by 
   A__SEL(s(sel(x0, x1)), cons(x2, from(z0))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), a__from(mark(z0))), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, first(z0, z1))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, sel(z0, z1))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, cons(z0, z1))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))

----------------------------------------

(94)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(95) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(96)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_2, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1


----------------------------------------

(97) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(s(z0)), cons(x1, x2)) -> c6(A__SEL(s(mark(z0)), mark(x2)), MARK(s(z0))) by 
   A__SEL(s(s(x0)), cons(x1, from(z0))) -> c6(A__SEL(s(mark(x0)), a__from(mark(z0))), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, first(z0, z1))) -> c6(A__SEL(s(mark(x0)), a__first(mark(z0), mark(z1))), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, sel(z0, z1))) -> c6(A__SEL(s(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, cons(z0, z1))) -> c6(A__SEL(s(mark(x0)), cons(mark(z0), z1)), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(A__SEL(s(mark(x0)), 0), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(A__SEL(s(mark(x0)), nil), MARK(s(x0)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))

----------------------------------------

(98)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(A__SEL(s(mark(x0)), 0), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(A__SEL(s(mark(x0)), nil), MARK(s(x0)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(A__SEL(s(mark(x0)), 0), MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(A__SEL(s(mark(x0)), nil), MARK(s(x0)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(99) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(100)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(101) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(0), cons(x1, x2)) -> c6(A__SEL(0, mark(x2))) by 
   A__SEL(s(0), cons(x0, from(z0))) -> c6(A__SEL(0, a__from(mark(z0))))
   A__SEL(s(0), cons(x0, first(z0, z1))) -> c6(A__SEL(0, a__first(mark(z0), mark(z1))))
   A__SEL(s(0), cons(x0, sel(z0, z1))) -> c6(A__SEL(0, a__sel(mark(z0), mark(z1))))
   A__SEL(s(0), cons(x0, cons(z0, z1))) -> c6(A__SEL(0, cons(mark(z0), z1)))
   A__SEL(s(0), cons(x0, s(z0))) -> c6(A__SEL(0, s(mark(z0))))
   A__SEL(s(0), cons(x0, 0)) -> c6(A__SEL(0, 0))
   A__SEL(s(0), cons(x0, nil)) -> c6(A__SEL(0, nil))

----------------------------------------

(102)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c6(A__SEL(0, s(mark(z0))))
   A__SEL(s(0), cons(x0, 0)) -> c6(A__SEL(0, 0))
   A__SEL(s(0), cons(x0, nil)) -> c6(A__SEL(0, nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c6(A__SEL(0, s(mark(z0))))
   A__SEL(s(0), cons(x0, 0)) -> c6(A__SEL(0, 0))
   A__SEL(s(0), cons(x0, nil)) -> c6(A__SEL(0, nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(103) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing nodes:
   A__SEL(s(0), cons(x0, nil)) -> c6(A__SEL(0, nil))
   A__SEL(s(0), cons(x0, 0)) -> c6(A__SEL(0, 0))
   A__SEL(s(0), cons(x0, s(z0))) -> c6(A__SEL(0, s(mark(z0))))

----------------------------------------

(104)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(105) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, from(z0))) -> c7(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0))) by 
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(A__SEL(nil, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))

----------------------------------------

(106)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(A__SEL(nil, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(cons(mark(z0), z1), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(A__SEL(nil, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(107) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(108)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(109) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, first(z0, z1))) -> c7(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1))) by 
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))

----------------------------------------

(110)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(A__SEL(mark(x0), first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(A__SEL(nil, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(111) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(112)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
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   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(113) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, sel(z0, z1))) -> c7(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1))) by 
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))

----------------------------------------

(114)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(A__SEL(mark(x0), sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(A__SEL(nil, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(115) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(116)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
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   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
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   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(117) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(x0), cons(x1, cons(z0, z1))) -> c7(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1))) by 
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(A__SEL(nil, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))

----------------------------------------

(118)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(A__SEL(nil, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(cons(mark(z0), z1), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(A__SEL(nil, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(119) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(120)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(121) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(from(z0)), cons(x1, x2)) -> c7(A__SEL(a__from(mark(z0)), mark(x2)), MARK(x2)) by 
   A__SEL(s(from(x0)), cons(x1, from(z0))) -> c7(A__SEL(a__from(mark(x0)), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(from(x0)), cons(x1, first(z0, z1))) -> c7(A__SEL(a__from(mark(x0)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(from(x0)), cons(x1, sel(z0, z1))) -> c7(A__SEL(a__from(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(from(x0)), cons(x1, cons(z0, z1))) -> c7(A__SEL(a__from(mark(x0)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c7(A__SEL(a__from(mark(x0)), 0), MARK(0))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c7(A__SEL(a__from(mark(x0)), nil), MARK(nil))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(from(mark(x0)), mark(x2)), MARK(x2))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))

----------------------------------------

(122)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
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   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c7(A__SEL(a__from(mark(x0)), 0), MARK(0))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c7(A__SEL(a__from(mark(x0)), nil), MARK(nil))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(from(mark(x0)), mark(x2)), MARK(x2))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c7(A__SEL(a__from(mark(x0)), 0), MARK(0))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c7(A__SEL(a__from(mark(x0)), nil), MARK(nil))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(from(mark(x0)), mark(x2)), MARK(x2))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(123) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   A__SEL(s(from(x0)), cons(x1, nil)) -> c7(A__SEL(a__from(mark(x0)), nil), MARK(nil))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c7(A__SEL(a__from(mark(x0)), 0), MARK(0))

----------------------------------------

(124)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(from(mark(x0)), mark(x2)), MARK(x2))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(A__SEL(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(A__SEL(from(mark(x0)), mark(x2)), MARK(x2))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(125) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(126)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
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   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(127) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(first(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__first(mark(z0), mark(z1)), mark(x2)), MARK(x2)) by 
   A__SEL(s(first(x0, x1)), cons(x2, from(z0))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, first(z0, z1))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(first(x0, x1)), cons(x2, sel(z0, z1))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(first(x0, x1)), cons(x2, cons(z0, z1))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))

----------------------------------------

(128)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(129) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__first(mark(x0), mark(x1)), nil), MARK(nil))

----------------------------------------

(130)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(A__SEL(first(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(131) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(132)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(133) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(sel(z0, z1)), cons(x1, x2)) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), mark(x2)), MARK(x2)) by 
   A__SEL(s(sel(x0, x1)), cons(x2, from(z0))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, first(z0, z1))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(sel(x0, x1)), cons(x2, sel(z0, z1))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(sel(x0, x1)), cons(x2, cons(z0, z1))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))

----------------------------------------

(134)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
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   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
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   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(0))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(135) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), 0), MARK(0))

----------------------------------------

(136)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(A__SEL(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(A__SEL(sel(mark(x0), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(137) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(138)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
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   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(139) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(s(z0)), cons(x1, x2)) -> c7(A__SEL(s(mark(z0)), mark(x2)), MARK(x2)) by 
   A__SEL(s(s(x0)), cons(x1, from(z0))) -> c7(A__SEL(s(mark(x0)), a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(s(x0)), cons(x1, first(z0, z1))) -> c7(A__SEL(s(mark(x0)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(s(x0)), cons(x1, sel(z0, z1))) -> c7(A__SEL(s(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(s(x0)), cons(x1, cons(z0, z1))) -> c7(A__SEL(s(mark(x0)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c7(A__SEL(s(mark(x0)), 0), MARK(0))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c7(A__SEL(s(mark(x0)), nil), MARK(nil))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))

----------------------------------------

(140)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
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   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
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   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c7(A__SEL(s(mark(x0)), 0), MARK(0))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c7(A__SEL(s(mark(x0)), nil), MARK(nil))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c7(A__SEL(s(mark(x0)), 0), MARK(0))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c7(A__SEL(s(mark(x0)), nil), MARK(nil))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(141) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   A__SEL(s(s(x0)), cons(x1, 0)) -> c7(A__SEL(s(mark(x0)), 0), MARK(0))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c7(A__SEL(s(mark(x0)), nil), MARK(nil))

----------------------------------------

(142)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(A__SEL(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(143) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing tuple parts
----------------------------------------

(144)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_2, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2


----------------------------------------

(145) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace A__SEL(s(0), cons(x1, x2)) -> c7(A__SEL(0, mark(x2)), MARK(x2)) by 
   A__SEL(s(0), cons(x0, from(z0))) -> c7(A__SEL(0, a__from(mark(z0))), MARK(from(z0)))
   A__SEL(s(0), cons(x0, first(z0, z1))) -> c7(A__SEL(0, a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   A__SEL(s(0), cons(x0, sel(z0, z1))) -> c7(A__SEL(0, a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   A__SEL(s(0), cons(x0, cons(z0, z1))) -> c7(A__SEL(0, cons(mark(z0), z1)), MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(A__SEL(0, s(mark(z0))), MARK(s(z0)))
   A__SEL(s(0), cons(x0, 0)) -> c7(A__SEL(0, 0), MARK(0))
   A__SEL(s(0), cons(x0, nil)) -> c7(A__SEL(0, nil), MARK(nil))

----------------------------------------

(146)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(A__SEL(0, s(mark(z0))), MARK(s(z0)))
   A__SEL(s(0), cons(x0, 0)) -> c7(A__SEL(0, 0), MARK(0))
   A__SEL(s(0), cons(x0, nil)) -> c7(A__SEL(0, nil), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(A__SEL(0, s(mark(z0))), MARK(s(z0)))
   A__SEL(s(0), cons(x0, 0)) -> c7(A__SEL(0, 0), MARK(0))
   A__SEL(s(0), cons(x0, nil)) -> c7(A__SEL(0, nil), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(147) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   A__SEL(s(0), cons(x0, 0)) -> c7(A__SEL(0, 0), MARK(0))
   A__SEL(s(0), cons(x0, nil)) -> c7(A__SEL(0, nil), MARK(nil))

----------------------------------------

(148)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(A__SEL(0, s(mark(z0))), MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(A__SEL(0, s(mark(z0))), MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(149) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing tuple parts
----------------------------------------

(150)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
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   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(151) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, from(z0))) -> c10(A__FIRST(mark(x0), a__from(mark(z0))), MARK(x0)) by 
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), from(mark(x1))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), from(x1))) -> c10(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(0, from(x1))) -> c10(A__FIRST(0, a__from(mark(x1))), MARK(0))
   MARK(first(nil, from(x1))) -> c10(A__FIRST(nil, a__from(mark(x1))), MARK(nil))

----------------------------------------

(152)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), from(mark(x1))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), from(x1))) -> c10(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(0, from(x1))) -> c10(A__FIRST(0, a__from(mark(x1))), MARK(0))
   MARK(first(nil, from(x1))) -> c10(A__FIRST(nil, a__from(mark(x1))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), from(mark(x1))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), from(x1))) -> c10(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(0, from(x1))) -> c10(A__FIRST(0, a__from(mark(x1))), MARK(0))
   MARK(first(nil, from(x1))) -> c10(A__FIRST(nil, a__from(mark(x1))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(153) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(0, from(x1))) -> c10(A__FIRST(0, a__from(mark(x1))), MARK(0))
   MARK(first(nil, from(x1))) -> c10(A__FIRST(nil, a__from(mark(x1))), MARK(nil))

----------------------------------------

(154)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), from(mark(x1))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), from(x1))) -> c10(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), from(mark(x1))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), from(x1))) -> c10(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(155) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(156)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
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   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
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   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
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   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
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   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
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   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(157) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, first(z0, z1))) -> c10(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0)) by 
   MARK(first(x0, first(x1, x2))) -> c10(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(0, first(x1, x2))) -> c10(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, first(x1, x2))) -> c10(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(158)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, x2))) -> c10(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(0, first(x1, x2))) -> c10(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, first(x1, x2))) -> c10(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, x2))) -> c10(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(0, first(x1, x2))) -> c10(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, first(x1, x2))) -> c10(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(159) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(nil, first(x1, x2))) -> c10(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(nil))
   MARK(first(0, first(x1, x2))) -> c10(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(0))

----------------------------------------

(160)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
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   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, x2))) -> c10(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(161) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(162)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
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   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(163) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, sel(z0, z1))) -> c10(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0)) by 
   MARK(first(x0, sel(x1, x2))) -> c10(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(0, sel(x1, x2))) -> c10(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, sel(x1, x2))) -> c10(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(164)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
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   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
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   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(0, sel(x1, x2))) -> c10(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, sel(x1, x2))) -> c10(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, x2))) -> c10(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(0, sel(x1, x2))) -> c10(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, sel(x1, x2))) -> c10(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(165) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(0, sel(x1, x2))) -> c10(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(first(nil, sel(x1, x2))) -> c10(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(166)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
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   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, x2))) -> c10(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, x2))) -> c10(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(167) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(168)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
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   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
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   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
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   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
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   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
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   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(169) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, cons(z0, z1))) -> c10(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(x0)) by 
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(0, cons(x1, x2))) -> c10(A__FIRST(0, cons(mark(x1), x2)), MARK(0))
   MARK(first(nil, cons(x1, x2))) -> c10(A__FIRST(nil, cons(mark(x1), x2)), MARK(nil))

----------------------------------------

(170)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(0, cons(x1, x2))) -> c10(A__FIRST(0, cons(mark(x1), x2)), MARK(0))
   MARK(first(nil, cons(x1, x2))) -> c10(A__FIRST(nil, cons(mark(x1), x2)), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(0, cons(x1, x2))) -> c10(A__FIRST(0, cons(mark(x1), x2)), MARK(0))
   MARK(first(nil, cons(x1, x2))) -> c10(A__FIRST(nil, cons(mark(x1), x2)), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(171) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(nil, cons(x1, x2))) -> c10(A__FIRST(nil, cons(mark(x1), x2)), MARK(nil))
   MARK(first(0, cons(x1, x2))) -> c10(A__FIRST(0, cons(mark(x1), x2)), MARK(0))

----------------------------------------

(172)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(173) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing tuple parts
----------------------------------------

(174)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
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   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(175) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(from(z0), x1)) -> c10(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(from(z0))) by 
   MARK(first(from(x0), from(z0))) -> c10(A__FIRST(a__from(mark(x0)), a__from(mark(z0))), MARK(from(x0)))
   MARK(first(from(x0), first(z0, z1))) -> c10(A__FIRST(a__from(mark(x0)), a__first(mark(z0), mark(z1))), MARK(from(x0)))
   MARK(first(from(x0), sel(z0, z1))) -> c10(A__FIRST(a__from(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(from(x0)))
   MARK(first(from(x0), cons(z0, z1))) -> c10(A__FIRST(a__from(mark(x0)), cons(mark(z0), z1)), MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(A__FIRST(a__from(mark(x0)), 0), MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(A__FIRST(a__from(mark(x0)), nil), MARK(from(x0)))
   MARK(first(from(x0), x1)) -> c10(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(from(x0)))
   MARK(first(from(x0), x1)) -> c10(A__FIRST(from(mark(x0)), mark(x1)), MARK(from(x0)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))

----------------------------------------

(176)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(x0), s(z0))) -> c10(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(A__FIRST(a__from(mark(x0)), 0), MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(A__FIRST(a__from(mark(x0)), nil), MARK(from(x0)))
   MARK(first(from(x0), x1)) -> c10(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(from(x0)))
   MARK(first(from(x0), x1)) -> c10(A__FIRST(from(mark(x0)), mark(x1)), MARK(from(x0)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(x0), s(z0))) -> c10(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(A__FIRST(a__from(mark(x0)), 0), MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(A__FIRST(a__from(mark(x0)), nil), MARK(from(x0)))
   MARK(first(from(x0), x1)) -> c10(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(from(x0)))
   MARK(first(from(x0), x1)) -> c10(A__FIRST(from(mark(x0)), mark(x1)), MARK(from(x0)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(177) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 5 trailing tuple parts
----------------------------------------

(178)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(179) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(first(z0, z1), x1)) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1))) by 
   MARK(first(first(x0, x1), from(z0))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), a__from(mark(z0))), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), first(z0, z1))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), sel(z0, z1))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), cons(z0, z1))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), 0), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), nil), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(first(x0, x1)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))

----------------------------------------

(180)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, x1), s(z0))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), 0), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), nil), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(first(x0, x1)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, x1), s(z0))) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), 0), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(A__FIRST(a__first(mark(x0), mark(x1)), nil), MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(first(x0, x1)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(181) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(182)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
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   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(183) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(sel(z0, z1), x1)) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1))) by 
   MARK(first(sel(x0, x1), from(z0))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), a__from(mark(z0))), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), first(z0, z1))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), sel(z0, z1))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), cons(z0, z1))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(sel(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))

----------------------------------------

(184)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
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   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(sel(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
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   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
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   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(sel(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(185) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(186)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
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   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_2, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2


----------------------------------------

(187) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(s(z0), x1)) -> c10(A__FIRST(s(mark(z0)), mark(x1)), MARK(s(z0))) by 
   MARK(first(s(x0), from(z0))) -> c10(A__FIRST(s(mark(x0)), a__from(mark(z0))), MARK(s(x0)))
   MARK(first(s(x0), first(z0, z1))) -> c10(A__FIRST(s(mark(x0)), a__first(mark(z0), mark(z1))), MARK(s(x0)))
   MARK(first(s(x0), sel(z0, z1))) -> c10(A__FIRST(s(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(s(x0)))
   MARK(first(s(x0), cons(z0, z1))) -> c10(A__FIRST(s(mark(x0)), cons(mark(z0), z1)), MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(A__FIRST(s(mark(x0)), 0), MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(A__FIRST(s(mark(x0)), nil), MARK(s(x0)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))

----------------------------------------

(188)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
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   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
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   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
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   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
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   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
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   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(x0), s(z0))) -> c10(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(A__FIRST(s(mark(x0)), 0), MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(A__FIRST(s(mark(x0)), nil), MARK(s(x0)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
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   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(x0), s(z0))) -> c10(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(A__FIRST(s(mark(x0)), 0), MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(A__FIRST(s(mark(x0)), nil), MARK(s(x0)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(189) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(190)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
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   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
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   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
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   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(191) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, from(z0))) -> c11(A__FIRST(mark(x0), a__from(mark(z0))), MARK(from(z0))) by 
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(A__FIRST(0, a__from(mark(x1))), MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(A__FIRST(nil, a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))

----------------------------------------

(192)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
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   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(A__FIRST(0, a__from(mark(x1))), MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(A__FIRST(nil, a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
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   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(A__FIRST(cons(mark(z0), z1), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(A__FIRST(0, a__from(mark(x1))), MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(A__FIRST(nil, a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(193) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(194)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, from(s(z0)))) -> c10(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(first(x0, from(0))) -> c10(A__FIRST(mark(x0), a__from(0)), MARK(x0))
   MARK(first(x0, from(nil))) -> c10(A__FIRST(mark(x0), a__from(nil)), MARK(x0))
   MARK(first(from(z0), from(x1))) -> c10(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(first(first(z0, z1), from(x1))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), from(x1))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(first(s(z0), from(x1))) -> c10(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), from(x1))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, first(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, first(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, first(x1, 0))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(195) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, first(z0, z1))) -> c11(A__FIRST(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1))) by 
   MARK(first(x0, first(x1, x2))) -> c11(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))

----------------------------------------

(196)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
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   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, x2))) -> c11(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
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   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, x2))) -> c11(A__FIRST(mark(x0), first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(A__FIRST(0, a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(A__FIRST(nil, a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(197) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(198)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
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   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, first(x1, nil))) -> c10(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(first(x0, first(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, first(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, first(0, x2))) -> c10(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(first(x0, first(nil, x2))) -> c10(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), first(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), first(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, first(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, sel(x1, from(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(first(x0, sel(x1, s(z0)))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(first(x0, sel(x1, 0))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(first(x0, sel(x1, nil))) -> c10(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(first(x0, sel(from(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(first(x0, sel(s(z0), x2))) -> c10(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(first(x0, sel(0, x2))) -> c10(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(first(x0, sel(nil, x2))) -> c10(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(first(from(z0), sel(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(first(s(z0), sel(x1, x2))) -> c10(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(first(x0, sel(x1, x2))) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(from(z0), x2))) -> c10(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(199) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, sel(z0, z1))) -> c11(A__FIRST(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1))) by 
   MARK(first(x0, sel(x1, x2))) -> c11(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))

----------------------------------------

(200)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   MARK(first(x0, cons(sel(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(x0))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c10(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(x0))
   MARK(first(x0, cons(s(z0), x2))) -> c10(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(x0))
   MARK(first(x0, cons(0, x2))) -> c10(A__FIRST(mark(x0), cons(0, x2)), MARK(x0))
   MARK(first(x0, cons(nil, x2))) -> c10(A__FIRST(mark(x0), cons(nil, x2)), MARK(x0))
   MARK(first(from(z0), cons(x1, x2))) -> c10(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(from(z0)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(first(z0, z1)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c10(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(sel(z0, z1)))
   MARK(first(s(z0), cons(x1, x2))) -> c10(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(s(z0)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(from(z0)), x1)) -> c10(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(from(from(z0))))
   MARK(first(from(first(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(from(first(z0, z1))))
   MARK(first(from(sel(z0, z1)), x1)) -> c10(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(from(sel(z0, z1))))
   MARK(first(from(cons(z0, z1)), x1)) -> c10(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(from(cons(z0, z1))))
   MARK(first(from(s(z0)), x1)) -> c10(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(from(s(z0))))
   MARK(first(from(0), x1)) -> c10(A__FIRST(a__from(0), mark(x1)), MARK(from(0)))
   MARK(first(from(nil), x1)) -> c10(A__FIRST(a__from(nil), mark(x1)), MARK(from(nil)))
   MARK(first(from(x0), x1)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), s(z0))) -> c10(MARK(from(x0)))
   MARK(first(from(x0), 0)) -> c10(MARK(from(x0)))
   MARK(first(from(x0), nil)) -> c10(MARK(from(x0)))
   MARK(first(first(x0, from(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(first(x0, from(z0))))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, first(z0, z1))))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(first(x0, sel(z0, z1))))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(first(x0, cons(z0, z1))))
   MARK(first(first(x0, s(z0)), x2)) -> c10(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(first(x0, s(z0))))
   MARK(first(first(x0, 0), x2)) -> c10(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(first(x0, 0)))
   MARK(first(first(x0, nil), x2)) -> c10(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(first(x0, nil)))
   MARK(first(first(from(z0), x1), x2)) -> c10(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(first(from(z0), x1)))
   MARK(first(first(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(first(z0, z1), x1)))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(first(sel(z0, z1), x1)))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(first(cons(z0, z1), x1)))
   MARK(first(first(s(z0), x1), x2)) -> c10(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(first(s(z0), x1)))
   MARK(first(first(0, x1), x2)) -> c10(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(first(0, x1)))
   MARK(first(first(nil, x1), x2)) -> c10(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(first(nil, x1)))
   MARK(first(first(x0, x1), s(z0))) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), 0)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), nil)) -> c10(MARK(first(x0, x1)))
   MARK(first(first(x0, x1), x2)) -> c10(MARK(first(x0, x1)))
   MARK(first(sel(x0, from(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(sel(x0, from(z0))))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, first(z0, z1))))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(A__FIRST(mark(x0), sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(A__FIRST(0, a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(A__FIRST(nil, a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(201) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 4 trailing tuple parts
----------------------------------------

(202)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
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   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
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   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(sel(x0, sel(z0, z1))))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(203) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(x0, cons(z0, z1))) -> c11(A__FIRST(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1))) by 
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(A__FIRST(0, cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(A__FIRST(nil, cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))

----------------------------------------

(204)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
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   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(A__FIRST(0, cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(A__FIRST(nil, cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(A__FIRST(cons(mark(z0), z1), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(A__FIRST(0, cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(A__FIRST(nil, cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(205) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(206)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
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   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
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   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(207) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(from(z0), x1)) -> c11(A__FIRST(a__from(mark(z0)), mark(x1)), MARK(x1)) by 
   MARK(first(from(x0), from(z0))) -> c11(A__FIRST(a__from(mark(x0)), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(from(x0), first(z0, z1))) -> c11(A__FIRST(a__from(mark(x0)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(from(x0), sel(z0, z1))) -> c11(A__FIRST(a__from(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(from(x0), cons(z0, z1))) -> c11(A__FIRST(a__from(mark(x0)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(from(x0), s(z0))) -> c11(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(x0), 0)) -> c11(A__FIRST(a__from(mark(x0)), 0), MARK(0))
   MARK(first(from(x0), nil)) -> c11(A__FIRST(a__from(mark(x0)), nil), MARK(nil))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(x1))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(from(mark(x0)), mark(x1)), MARK(x1))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))

----------------------------------------

(208)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
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   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(x0), s(z0))) -> c11(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(x0), 0)) -> c11(A__FIRST(a__from(mark(x0)), 0), MARK(0))
   MARK(first(from(x0), nil)) -> c11(A__FIRST(a__from(mark(x0)), nil), MARK(nil))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(x1))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(from(mark(x0)), mark(x1)), MARK(x1))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(x0), s(z0))) -> c11(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(x0), 0)) -> c11(A__FIRST(a__from(mark(x0)), 0), MARK(0))
   MARK(first(from(x0), nil)) -> c11(A__FIRST(a__from(mark(x0)), nil), MARK(nil))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(x1))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(from(mark(x0)), mark(x1)), MARK(x1))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(209) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(from(x0), nil)) -> c11(A__FIRST(a__from(mark(x0)), nil), MARK(nil))
   MARK(first(from(x0), 0)) -> c11(A__FIRST(a__from(mark(x0)), 0), MARK(0))

----------------------------------------

(210)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(x0), s(z0))) -> c11(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(x1))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(from(mark(x0)), mark(x1)), MARK(x1))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(x0), s(z0))) -> c11(A__FIRST(a__from(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(cons(mark(mark(x0)), from(s(mark(x0)))), mark(x1)), MARK(x1))
   MARK(first(from(x0), x1)) -> c11(A__FIRST(from(mark(x0)), mark(x1)), MARK(x1))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(211) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(212)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(213) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(first(z0, z1), x1)) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1)) by 
   MARK(first(first(x0, x1), from(z0))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(first(x0, x1), first(z0, z1))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(first(x0, x1), sel(z0, z1))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(first(x0, x1), cons(z0, z1))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(first(x0, x1), s(z0))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(first(x0, x1), 0)) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), 0), MARK(0))
   MARK(first(first(x0, x1), nil)) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), nil), MARK(nil))
   MARK(first(first(x0, x1), x2)) -> c11(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))

----------------------------------------

(214)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(0), cons(x0, s(z0))) -> c7(MARK(s(z0)))
   MARK(first(x0, from(x1))) -> c10(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(sel(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
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   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, x1), s(z0))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(first(x0, x1), 0)) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), 0), MARK(0))
   MARK(first(first(x0, x1), nil)) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), nil), MARK(nil))
   MARK(first(first(x0, x1), x2)) -> c11(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
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   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(215) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(first(x0, x1), 0)) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), 0), MARK(0))
   MARK(first(first(x0, x1), nil)) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), nil), MARK(nil))

----------------------------------------

(216)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
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   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, x1), s(z0))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
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   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, x1), s(z0))) -> c11(A__FIRST(a__first(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(A__FIRST(first(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(217) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(218)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(sel(cons(z0, z1), x1)))
   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
   MARK(first(sel(0, x1), x2)) -> c10(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(sel(0, x1)))
   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
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   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
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   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c7(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
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   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c7(A__SEL(s(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(s(0)), cons(x1, x2)) -> c7(A__SEL(s(0), mark(x2)), MARK(x2))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c7(A__SEL(s(nil), mark(x2)), MARK(x2))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
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   MARK(first(x0, from(from(z0)))) -> c10(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(first(x0, from(first(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
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   MARK(first(x0, from(cons(z0, z1)))) -> c10(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
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   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(219) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(sel(z0, z1), x1)) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1)) by 
   MARK(first(sel(x0, x1), from(z0))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(sel(x0, x1), first(z0, z1))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(sel(x0, x1), sel(z0, z1))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(sel(x0, x1), cons(z0, z1))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(sel(x0, x1), s(z0))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(sel(x0, x1), 0)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(0))
   MARK(first(sel(x0, x1), nil)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   MARK(first(sel(x0, x1), x2)) -> c11(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))

----------------------------------------

(220)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
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   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
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   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(sel(x0, x1), 0)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(0))
   MARK(first(sel(x0, x1), nil)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   MARK(first(sel(x0, x1), x2)) -> c11(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
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   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c10(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(sel(x0, cons(z0, z1))))
   MARK(first(sel(x0, s(z0)), x2)) -> c10(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(sel(x0, s(z0))))
   MARK(first(sel(x0, 0), x2)) -> c10(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(sel(x0, 0)))
   MARK(first(sel(x0, nil), x2)) -> c10(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(sel(x0, nil)))
   MARK(first(sel(from(z0), x1), x2)) -> c10(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(sel(from(z0), x1)))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(first(z0, z1), x1)))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c10(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(sel(sel(z0, z1), x1)))
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   MARK(first(sel(s(z0), x1), x2)) -> c10(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(sel(s(z0), x1)))
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   MARK(first(sel(nil, x1), x2)) -> c10(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(sel(nil, x1)))
   MARK(first(sel(x0, x1), s(z0))) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), 0)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), nil)) -> c10(MARK(sel(x0, x1)))
   MARK(first(sel(x0, x1), x2)) -> c10(MARK(sel(x0, x1)))
   MARK(first(s(from(z0)), x1)) -> c10(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(s(from(z0))))
   MARK(first(s(first(z0, z1)), x1)) -> c10(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(s(first(z0, z1))))
   MARK(first(s(sel(z0, z1)), x1)) -> c10(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(s(sel(z0, z1))))
   MARK(first(s(cons(z0, z1)), x1)) -> c10(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(s(cons(z0, z1))))
   MARK(first(s(s(z0)), x1)) -> c10(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(s(s(z0))))
   MARK(first(s(0), x1)) -> c10(A__FIRST(s(0), mark(x1)), MARK(s(0)))
   MARK(first(s(nil), x1)) -> c10(A__FIRST(s(nil), mark(x1)), MARK(s(nil)))
   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(sel(x0, x1), 0)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(0))
   MARK(first(sel(x0, x1), nil)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   MARK(first(sel(x0, x1), x2)) -> c11(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(221) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(sel(x0, x1), nil)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), nil), MARK(nil))
   MARK(first(sel(x0, x1), 0)) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), 0), MARK(0))

----------------------------------------

(222)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
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   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
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   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(A__FIRST(a__sel(mark(x0), mark(x1)), s(mark(z0))), MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(A__FIRST(sel(mark(x0), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(223) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing tuple parts
----------------------------------------

(224)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
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   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
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   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_2, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2


----------------------------------------

(225) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(first(s(z0), x1)) -> c11(A__FIRST(s(mark(z0)), mark(x1)), MARK(x1)) by 
   MARK(first(s(x0), from(z0))) -> c11(A__FIRST(s(mark(x0)), a__from(mark(z0))), MARK(from(z0)))
   MARK(first(s(x0), first(z0, z1))) -> c11(A__FIRST(s(mark(x0)), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(first(s(x0), sel(z0, z1))) -> c11(A__FIRST(s(mark(x0)), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(first(s(x0), cons(z0, z1))) -> c11(A__FIRST(s(mark(x0)), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(first(s(x0), s(z0))) -> c11(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(s(x0), 0)) -> c11(A__FIRST(s(mark(x0)), 0), MARK(0))
   MARK(first(s(x0), nil)) -> c11(A__FIRST(s(mark(x0)), nil), MARK(nil))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))

----------------------------------------

(226)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
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   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(x0), s(z0))) -> c11(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(s(x0), 0)) -> c11(A__FIRST(s(mark(x0)), 0), MARK(0))
   MARK(first(s(x0), nil)) -> c11(A__FIRST(s(mark(x0)), nil), MARK(nil))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(x0), s(z0))) -> c11(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(s(x0), 0)) -> c11(A__FIRST(s(mark(x0)), 0), MARK(0))
   MARK(first(s(x0), nil)) -> c11(A__FIRST(s(mark(x0)), nil), MARK(nil))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(227) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 2 trailing nodes:
   MARK(first(s(x0), nil)) -> c11(A__FIRST(s(mark(x0)), nil), MARK(nil))
   MARK(first(s(x0), 0)) -> c11(A__FIRST(s(mark(x0)), 0), MARK(0))

----------------------------------------

(228)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
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   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
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   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
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   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(x0), s(z0))) -> c11(A__FIRST(s(mark(x0)), s(mark(z0))), MARK(s(z0)))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(229) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing tuple parts
----------------------------------------

(230)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
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   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
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   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
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   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
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   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(231) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(sel(x0, from(z0))) -> c12(A__SEL(mark(x0), a__from(mark(z0))), MARK(x0)) by 
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), from(mark(x1))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(A__SEL(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))), MARK(0))
   MARK(sel(nil, from(x1))) -> c12(A__SEL(nil, a__from(mark(x1))), MARK(nil))

----------------------------------------

(232)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
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   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), from(mark(x1))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(A__SEL(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))), MARK(0))
   MARK(sel(nil, from(x1))) -> c12(A__SEL(nil, a__from(mark(x1))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
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   MARK(first(s(x0), x1)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), s(z0))) -> c10(MARK(s(x0)))
   MARK(first(s(x0), 0)) -> c10(MARK(s(x0)))
   MARK(first(s(x0), nil)) -> c10(MARK(s(x0)))
   MARK(first(x0, from(x1))) -> c11(A__FIRST(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(from(x1)))
   MARK(first(x0, from(from(z0)))) -> c11(A__FIRST(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   MARK(first(x0, from(first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   MARK(first(x0, from(sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   MARK(first(x0, from(cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   MARK(first(x0, from(s(z0)))) -> c11(A__FIRST(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   MARK(first(x0, from(0))) -> c11(A__FIRST(mark(x0), a__from(0)), MARK(from(0)))
   MARK(first(x0, from(nil))) -> c11(A__FIRST(mark(x0), a__from(nil)), MARK(from(nil)))
   MARK(first(from(z0), from(x1))) -> c11(A__FIRST(a__from(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(first(z0, z1), from(x1))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(sel(z0, z1), from(x1))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(s(z0), from(x1))) -> c11(A__FIRST(s(mark(z0)), a__from(mark(x1))), MARK(from(x1)))
   MARK(first(x0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(cons(z0, z1), from(x1))) -> c11(MARK(from(x1)))
   MARK(first(0, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(nil, from(x1))) -> c11(MARK(from(x1)))
   MARK(first(x0, first(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(first(x1, from(z0))))
   MARK(first(x0, first(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(first(x1, first(z0, z1))))
   MARK(first(x0, first(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(first(x1, sel(z0, z1))))
   MARK(first(x0, first(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(first(x1, cons(z0, z1))))
   MARK(first(x0, first(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(first(x1, s(z0))))
   MARK(first(x0, first(x1, 0))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), 0)), MARK(first(x1, 0)))
   MARK(first(x0, first(x1, nil))) -> c11(A__FIRST(mark(x0), a__first(mark(x1), nil)), MARK(first(x1, nil)))
   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), from(mark(x1))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(A__SEL(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))), MARK(0))
   MARK(sel(nil, from(x1))) -> c12(A__SEL(nil, a__from(mark(x1))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(233) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   MARK(sel(nil, from(x1))) -> c12(A__SEL(nil, a__from(mark(x1))), MARK(nil))

----------------------------------------

(234)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c7(MARK(x3))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c7(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(x3))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c7(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(x3))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c7(MARK(s(z0)))
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   MARK(first(x0, first(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(first(from(z0), x2)))
   MARK(first(x0, first(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(first(first(z0, z1), x2)))
   MARK(first(x0, first(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(first(sel(z0, z1), x2)))
   MARK(first(x0, first(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(first(cons(z0, z1), x2)))
   MARK(first(x0, first(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(first(s(z0), x2)))
   MARK(first(x0, first(0, x2))) -> c11(A__FIRST(mark(x0), a__first(0, mark(x2))), MARK(first(0, x2)))
   MARK(first(x0, first(nil, x2))) -> c11(A__FIRST(mark(x0), a__first(nil, mark(x2))), MARK(first(nil, x2)))
   MARK(first(from(z0), first(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(first(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(sel(z0, z1), first(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(s(z0), first(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(first(x1, x2)))
   MARK(first(x0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(cons(z0, z1), first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(0, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(nil, first(x1, x2))) -> c11(MARK(first(x1, x2)))
   MARK(first(x0, sel(x1, from(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(sel(x1, from(z0))))
   MARK(first(x0, sel(x1, first(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(sel(x1, first(z0, z1))))
   MARK(first(x0, sel(x1, sel(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(sel(x1, sel(z0, z1))))
   MARK(first(x0, sel(x1, cons(z0, z1)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(sel(x1, cons(z0, z1))))
   MARK(first(x0, sel(x1, s(z0)))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(sel(x1, s(z0))))
   MARK(first(x0, sel(x1, 0))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), 0)), MARK(sel(x1, 0)))
   MARK(first(x0, sel(x1, nil))) -> c11(A__FIRST(mark(x0), a__sel(mark(x1), nil)), MARK(sel(x1, nil)))
   MARK(first(x0, sel(from(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(sel(from(z0), x2)))
   MARK(first(x0, sel(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(sel(first(z0, z1), x2)))
   MARK(first(x0, sel(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(sel(sel(z0, z1), x2)))
   MARK(first(x0, sel(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(sel(cons(z0, z1), x2)))
   MARK(first(x0, sel(s(z0), x2))) -> c11(A__FIRST(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(sel(s(z0), x2)))
   MARK(first(x0, sel(0, x2))) -> c11(A__FIRST(mark(x0), a__sel(0, mark(x2))), MARK(sel(0, x2)))
   MARK(first(x0, sel(nil, x2))) -> c11(A__FIRST(mark(x0), a__sel(nil, mark(x2))), MARK(sel(nil, x2)))
   MARK(first(from(z0), sel(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), from(mark(x1))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(A__SEL(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
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   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
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   MARK(first(first(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(sel(z0, z1), sel(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(s(z0), sel(x1, x2))) -> c11(A__FIRST(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(sel(x1, x2)))
   MARK(first(x0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(cons(z0, z1), sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(0, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(nil, sel(x1, x2))) -> c11(MARK(sel(x1, x2)))
   MARK(first(x0, cons(from(z0), x2))) -> c11(A__FIRST(mark(x0), cons(a__from(mark(z0)), x2)), MARK(cons(from(z0), x2)))
   MARK(first(x0, cons(first(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__first(mark(z0), mark(z1)), x2)), MARK(cons(first(z0, z1), x2)))
   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), from(mark(x1))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(A__SEL(cons(mark(z0), z1), a__from(mark(x1))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(235) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(236)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
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   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
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   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
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   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
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   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(237) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(sel(x0, first(z0, z1))) -> c12(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(x0)) by 
   MARK(sel(x0, first(x1, x2))) -> c12(A__SEL(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))), MARK(0))
   MARK(sel(nil, first(x1, x2))) -> c12(A__SEL(nil, a__first(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(238)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
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   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, x2))) -> c12(A__SEL(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))), MARK(0))
   MARK(sel(nil, first(x1, x2))) -> c12(A__SEL(nil, a__first(mark(x1), mark(x2))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
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   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
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   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
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   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, x2))) -> c12(A__SEL(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))), MARK(0))
   MARK(sel(nil, first(x1, x2))) -> c12(A__SEL(nil, a__first(mark(x1), mark(x2))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(239) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   MARK(sel(nil, first(x1, x2))) -> c12(A__SEL(nil, a__first(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(240)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
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   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, x2))) -> c12(A__SEL(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(sel(x0, first(x1, x2))) -> c12(A__SEL(mark(x0), first(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__first(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(241) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(242)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c7(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(x2))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(x2))
   A__SEL(s(from(0)), cons(x1, x2)) -> c7(A__SEL(a__from(0), mark(x2)), MARK(x2))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c7(A__SEL(a__from(nil), mark(x2)), MARK(x2))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c7(MARK(x2))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c7(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(x3))
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   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(243) CdtNarrowingProof (BOTH BOUNDS(ID, ID))
Use narrowing to replace MARK(sel(x0, sel(z0, z1))) -> c12(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(x0)) by 
   MARK(sel(x0, sel(x1, x2))) -> c12(A__SEL(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(sel(nil, sel(x1, x2))) -> c12(A__SEL(nil, a__sel(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(244)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c7(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(cons(from(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(cons(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(cons(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(cons(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c7(A__SEL(mark(x0), cons(0, x3)), MARK(cons(0, x3)))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c7(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c7(A__SEL(0, cons(mark(x2), x3)), MARK(cons(x2, x3)))
   A__SEL(s(x0), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(nil), cons(x1, cons(x2, x3))) -> c7(MARK(cons(x2, x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c7(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(x2))
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   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
   MARK(sel(x0, sel(x1, x2))) -> c12(A__SEL(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(sel(nil, sel(x1, x2))) -> c12(A__SEL(nil, a__sel(mark(x1), mark(x2))), MARK(nil))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c7(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(sel(0, x3)))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c7(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(sel(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c7(A__SEL(0, a__sel(mark(x2), mark(x3))), MARK(sel(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
   A__SEL(s(nil), cons(x1, sel(x2, x3))) -> c7(MARK(sel(x2, x3)))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c7(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(cons(s(z0), x3)))
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   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c7(A__SEL(mark(x0), cons(nil, x3)), MARK(cons(nil, x3)))
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   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
   MARK(sel(x0, sel(x1, x2))) -> c12(A__SEL(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))), MARK(0))
   MARK(sel(nil, sel(x1, x2))) -> c12(A__SEL(nil, a__sel(mark(x1), mark(x2))), MARK(nil))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(245) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID))
Removed 1 trailing nodes:
   MARK(sel(nil, sel(x1, x2))) -> c12(A__SEL(nil, a__sel(mark(x1), mark(x2))), MARK(nil))

----------------------------------------

(246)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__sel(mark(z0), mark(z1)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, cons(x2, x3))) -> c6(A__SEL(0, cons(mark(x2), x3)))
   A__SEL(s(from(from(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(a__from(mark(z0))), mark(x2)), MARK(from(from(z0))))
   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
   A__SEL(s(from(0)), cons(x1, x2)) -> c6(A__SEL(a__from(0), mark(x2)), MARK(from(0)))
   A__SEL(s(from(nil)), cons(x1, x2)) -> c6(A__SEL(a__from(nil), mark(x2)), MARK(from(nil)))
   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
   A__SEL(s(first(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__from(mark(z0))), mark(x3)), MARK(first(x0, from(z0))))
   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
   A__SEL(s(first(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), nil), mark(x3)), MARK(first(x0, nil)))
   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
   A__SEL(s(first(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(0, mark(x1)), mark(x3)), MARK(first(0, x1)))
   A__SEL(s(first(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__first(nil, mark(x1)), mark(x3)), MARK(first(nil, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(sel(x0, from(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__from(mark(z0))), mark(x3)), MARK(sel(x0, from(z0))))
   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
   A__SEL(s(sel(x0, nil)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), nil), mark(x3)), MARK(sel(x0, nil)))
   A__SEL(s(sel(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(sel(from(z0), x1)))
   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
   A__SEL(s(sel(0, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(0, mark(x1)), mark(x3)), MARK(sel(0, x1)))
   A__SEL(s(sel(nil, x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(nil, mark(x1)), mark(x3)), MARK(sel(nil, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
   A__SEL(s(s(x0)), cons(x1, x2)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c7(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(from(from(z0))))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(from(first(z0, z1))))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(from(sel(z0, z1))))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(from(cons(z0, z1))))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c7(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(from(s(z0))))
   A__SEL(s(x0), cons(x1, from(0))) -> c7(A__SEL(mark(x0), a__from(0)), MARK(from(0)))
   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c7(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c7(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(0), cons(x1, from(x2))) -> c7(A__SEL(0, a__from(mark(x2))), MARK(from(x2)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(first(x2, from(z0))))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(first(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(first(x2, s(z0))))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c7(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(first(x2, nil)))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c7(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(first(from(z0), x3)))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(first(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(first(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(first(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c7(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(first(s(z0), x3)))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c7(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(first(0, x3)))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c7(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(first(nil, x3)))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c7(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c7(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c7(A__SEL(0, a__first(mark(x2), mark(x3))), MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(nil), cons(x1, first(x2, x3))) -> c7(MARK(first(x2, x3)))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(sel(x2, from(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(sel(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(sel(x2, sel(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(sel(x2, cons(z0, z1))))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(sel(x2, s(z0))))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(sel(x2, 0)))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c7(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(sel(x2, nil)))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(sel(from(z0), x3)))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(sel(first(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(sel(sel(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c7(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(sel(cons(z0, z1), x3)))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c7(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(sel(s(z0), x3)))
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   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
   MARK(sel(x0, sel(x1, x2))) -> c12(A__SEL(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))), MARK(0))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, sel(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(a__first(mark(z0), mark(z1)), x3)), MARK(x0))
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   A__SEL(s(x0), cons(x1, cons(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), cons(cons(mark(z0), z1), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), cons(mark(x2), x3)), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, cons(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), cons(mark(x2), x3)), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, 0)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(first(z0, z1), x1)))
   A__SEL(s(sel(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(sel(sel(z0, z1), x1)))
   A__SEL(s(sel(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(sel(cons(z0, z1), x1)))
   A__SEL(s(sel(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__sel(s(mark(z0)), mark(x1)), mark(x3)), MARK(sel(s(z0), x1)))
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   A__SEL(s(sel(x0, x1)), cons(x2, s(z0))) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, 0)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(s(from(z0))), cons(x1, x2)) -> c6(A__SEL(s(a__from(mark(z0))), mark(x2)), MARK(s(from(z0))))
   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   A__SEL(s(x0), cons(x1, from(nil))) -> c7(A__SEL(mark(x0), a__from(nil)), MARK(from(nil)))
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   A__SEL(s(x0), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c7(MARK(from(x2)))
   A__SEL(s(nil), cons(x1, from(x2))) -> c7(MARK(from(x2)))
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   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(first(x2, first(z0, z1))))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c7(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(first(x2, sel(z0, z1))))
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   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c7(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(first(x2, 0)))
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   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
   MARK(sel(x0, sel(x1, x2))) -> c12(A__SEL(mark(x0), sel(mark(x1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(A__SEL(cons(mark(z0), z1), a__sel(mark(x1), mark(x2))), MARK(cons(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))), MARK(0))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2


----------------------------------------

(247) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID))
Removed 3 trailing tuple parts
----------------------------------------

(248)
Obligation:
Complexity Dependency Tuples Problem

Rules:
   a__from(z0) -> cons(mark(z0), from(s(z0)))
   a__from(z0) -> from(z0)
   a__first(0, z0) -> nil
   a__first(s(z0), cons(z1, z2)) -> cons(mark(z1), first(z0, z2))
   a__first(z0, z1) -> first(z0, z1)
   a__sel(0, cons(z0, z1)) -> mark(z0)
   a__sel(s(z0), cons(z1, z2)) -> a__sel(mark(z0), mark(z2))
   a__sel(z0, z1) -> sel(z0, z1)
   mark(from(z0)) -> a__from(mark(z0))
   mark(first(z0, z1)) -> a__first(mark(z0), mark(z1))
   mark(sel(z0, z1)) -> a__sel(mark(z0), mark(z1))
   mark(cons(z0, z1)) -> cons(mark(z0), z1)
   mark(s(z0)) -> s(mark(z0))
   mark(0) -> 0
   mark(nil) -> nil
Tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, 0))) -> c6(A__SEL(mark(x0), a__first(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, nil))) -> c6(A__SEL(mark(x0), a__first(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, first(from(z0), x3))) -> c6(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
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   A__SEL(s(x0), cons(x1, first(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(s(z0), x3))) -> c6(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(0, x3))) -> c6(A__SEL(mark(x0), a__first(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(nil, x3))) -> c6(A__SEL(mark(x0), a__first(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__first(mark(x2), mark(x3))), MARK(from(z0)))
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   A__SEL(s(sel(z0, z1)), cons(x1, first(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, first(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__first(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, first(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, first(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, first(x2, x3))) -> c6(A__SEL(0, a__first(mark(x2), mark(x3))))
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   A__SEL(s(x0), cons(x1, sel(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, s(z0)))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, 0))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), 0)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(x2, nil))) -> c6(A__SEL(mark(x0), a__sel(mark(x2), nil)), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(from(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(first(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(sel(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(cons(z0, z1), x3))) -> c6(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(s(z0), x3))) -> c6(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(0, x3))) -> c6(A__SEL(mark(x0), a__sel(0, mark(x3))), MARK(x0))
   A__SEL(s(x0), cons(x1, sel(nil, x3))) -> c6(A__SEL(mark(x0), a__sel(nil, mark(x3))), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__from(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, sel(x2, x3))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x2), mark(x3))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, sel(x2, x3))) -> c6(A__SEL(s(mark(z0)), a__sel(mark(x2), mark(x3))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, sel(x2, x3))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, sel(x2, x3))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, sel(x2, x3))) -> c6(A__SEL(0, a__sel(mark(x2), mark(x3))))
   A__SEL(s(x0), cons(x1, cons(from(z0), x3))) -> c6(A__SEL(mark(x0), cons(a__from(mark(z0)), x3)), MARK(x0))
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   A__SEL(s(x0), cons(x1, cons(s(z0), x3))) -> c6(A__SEL(mark(x0), cons(s(mark(z0)), x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(0, x3))) -> c6(A__SEL(mark(x0), cons(0, x3)), MARK(x0))
   A__SEL(s(x0), cons(x1, cons(nil, x3))) -> c6(A__SEL(mark(x0), cons(nil, x3)), MARK(x0))
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   A__SEL(s(s(z0)), cons(x1, cons(x2, x3))) -> c6(A__SEL(s(mark(z0)), cons(mark(x2), x3)), MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, cons(x2, x3))) -> c6(MARK(cons(z0, z1)))
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   A__SEL(s(from(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__first(mark(z0), mark(z1))), mark(x2)), MARK(from(first(z0, z1))))
   A__SEL(s(from(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(from(sel(z0, z1))))
   A__SEL(s(from(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(a__from(cons(mark(z0), z1)), mark(x2)), MARK(from(cons(z0, z1))))
   A__SEL(s(from(s(z0))), cons(x1, x2)) -> c6(A__SEL(a__from(s(mark(z0))), mark(x2)), MARK(from(s(z0))))
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   A__SEL(s(from(x0)), cons(x1, x2)) -> c6(MARK(from(x0)))
   A__SEL(s(from(x0)), cons(x1, s(z0))) -> c6(MARK(from(x0)))
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   A__SEL(s(from(x0)), cons(x1, nil)) -> c6(MARK(from(x0)))
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   A__SEL(s(first(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, first(z0, z1))))
   A__SEL(s(first(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(first(x0, sel(z0, z1))))
   A__SEL(s(first(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(first(x0, cons(z0, z1))))
   A__SEL(s(first(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), s(mark(z0))), mark(x3)), MARK(first(x0, s(z0))))
   A__SEL(s(first(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__first(mark(x0), 0), mark(x3)), MARK(first(x0, 0)))
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   A__SEL(s(first(from(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__from(mark(z0)), mark(x1)), mark(x3)), MARK(first(from(z0), x1)))
   A__SEL(s(first(first(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(first(z0, z1), x1)))
   A__SEL(s(first(sel(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x3)), MARK(first(sel(z0, z1), x1)))
   A__SEL(s(first(cons(z0, z1), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(cons(mark(z0), z1), mark(x1)), mark(x3)), MARK(first(cons(z0, z1), x1)))
   A__SEL(s(first(s(z0), x1)), cons(x2, x3)) -> c6(A__SEL(a__first(s(mark(z0)), mark(x1)), mark(x3)), MARK(first(s(z0), x1)))
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   A__SEL(s(first(x0, x1)), cons(x2, s(z0))) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, 0)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, nil)) -> c6(MARK(first(x0, x1)))
   A__SEL(s(first(x0, x1)), cons(x2, x3)) -> c6(MARK(first(x0, x1)))
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   A__SEL(s(sel(x0, first(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, first(z0, z1))))
   A__SEL(s(sel(x0, sel(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x3)), MARK(sel(x0, sel(z0, z1))))
   A__SEL(s(sel(x0, cons(z0, z1))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), cons(mark(z0), z1)), mark(x3)), MARK(sel(x0, cons(z0, z1))))
   A__SEL(s(sel(x0, s(z0))), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), s(mark(z0))), mark(x3)), MARK(sel(x0, s(z0))))
   A__SEL(s(sel(x0, 0)), cons(x2, x3)) -> c6(A__SEL(a__sel(mark(x0), 0), mark(x3)), MARK(sel(x0, 0)))
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   A__SEL(s(sel(x0, x1)), cons(x2, nil)) -> c6(MARK(sel(x0, x1)))
   A__SEL(s(sel(x0, x1)), cons(x2, x3)) -> c6(MARK(sel(x0, x1)))
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   A__SEL(s(s(first(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__first(mark(z0), mark(z1))), mark(x2)), MARK(s(first(z0, z1))))
   A__SEL(s(s(sel(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(a__sel(mark(z0), mark(z1))), mark(x2)), MARK(s(sel(z0, z1))))
   A__SEL(s(s(cons(z0, z1))), cons(x1, x2)) -> c6(A__SEL(s(cons(mark(z0), z1)), mark(x2)), MARK(s(cons(z0, z1))))
   A__SEL(s(s(s(z0))), cons(x1, x2)) -> c6(A__SEL(s(s(mark(z0))), mark(x2)), MARK(s(s(z0))))
   A__SEL(s(s(0)), cons(x1, x2)) -> c6(A__SEL(s(0), mark(x2)), MARK(s(0)))
   A__SEL(s(s(nil)), cons(x1, x2)) -> c6(A__SEL(s(nil), mark(x2)), MARK(s(nil)))
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   A__SEL(s(s(x0)), cons(x1, s(z0))) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, 0)) -> c6(MARK(s(x0)))
   A__SEL(s(s(x0)), cons(x1, nil)) -> c6(MARK(s(x0)))
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   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, sel(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))))
S tuples:
   A__FROM(z0) -> c(MARK(z0))
   A__FIRST(s(z0), cons(z1, z2)) -> c3(MARK(z1))
   A__SEL(0, cons(z0, z1)) -> c5(MARK(z0))
   MARK(from(z0)) -> c9(A__FROM(mark(z0)), MARK(z0))
   MARK(cons(z0, z1)) -> c14(MARK(z0))
   MARK(s(z0)) -> c15(MARK(z0))
   A__SEL(s(x0), cons(x1, s(z0))) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, 0)) -> c6(MARK(x0))
   A__SEL(s(x0), cons(x1, nil)) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(x0), cons(x1, s(z0))) -> c7(MARK(s(z0)))
   A__SEL(s(cons(z0, z1)), cons(x1, x2)) -> c7(MARK(x2))
   A__SEL(s(nil), cons(x1, x2)) -> c7(MARK(x2))
   MARK(first(x0, s(z0))) -> c10(MARK(x0))
   MARK(first(x0, 0)) -> c10(MARK(x0))
   MARK(first(x0, nil)) -> c10(MARK(x0))
   MARK(first(cons(z0, z1), x1)) -> c10(MARK(cons(z0, z1)))
   MARK(first(x0, s(z0))) -> c11(MARK(s(z0)))
   MARK(first(cons(z0, z1), x1)) -> c11(MARK(x1))
   MARK(first(0, x1)) -> c11(MARK(x1))
   MARK(first(nil, x1)) -> c11(MARK(x1))
   MARK(sel(x0, cons(z0, z1))) -> c12(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(x0))
   MARK(sel(from(z0), x1)) -> c12(A__SEL(a__from(mark(z0)), mark(x1)), MARK(from(z0)))
   MARK(sel(first(z0, z1), x1)) -> c12(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), x1)) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(sel(z0, z1)))
   MARK(sel(s(z0), x1)) -> c12(A__SEL(s(mark(z0)), mark(x1)), MARK(s(z0)))
   MARK(sel(x0, s(z0))) -> c12(MARK(x0))
   MARK(sel(x0, 0)) -> c12(MARK(x0))
   MARK(sel(x0, nil)) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), x1)) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, x1)) -> c12(A__SEL(0, mark(x1)))
   MARK(sel(x0, from(z0))) -> c13(A__SEL(mark(x0), a__from(mark(z0))), MARK(from(z0)))
   MARK(sel(x0, first(z0, z1))) -> c13(A__SEL(mark(x0), a__first(mark(z0), mark(z1))), MARK(first(z0, z1)))
   MARK(sel(x0, sel(z0, z1))) -> c13(A__SEL(mark(x0), a__sel(mark(z0), mark(z1))), MARK(sel(z0, z1)))
   MARK(sel(x0, cons(z0, z1))) -> c13(A__SEL(mark(x0), cons(mark(z0), z1)), MARK(cons(z0, z1)))
   MARK(sel(from(z0), x1)) -> c13(A__SEL(a__from(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(first(z0, z1), x1)) -> c13(A__SEL(a__first(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(sel(z0, z1), x1)) -> c13(A__SEL(a__sel(mark(z0), mark(z1)), mark(x1)), MARK(x1))
   MARK(sel(s(z0), x1)) -> c13(A__SEL(s(mark(z0)), mark(x1)), MARK(x1))
   MARK(sel(0, x1)) -> c13(A__SEL(0, mark(x1)), MARK(x1))
   MARK(sel(x0, s(z0))) -> c13(MARK(s(z0)))
   MARK(sel(cons(z0, z1), x1)) -> c13(MARK(x1))
   MARK(sel(nil, x1)) -> c13(MARK(x1))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(A__SEL(mark(x0), cons(mark(mark(x2)), from(s(mark(x2))))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(from(z0)))) -> c6(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(first(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(sel(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(cons(z0, z1)))) -> c6(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(s(z0)))) -> c6(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, from(0))) -> c6(A__SEL(mark(x0), a__from(0)), MARK(x0))
   A__SEL(s(x0), cons(x1, from(nil))) -> c6(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   A__SEL(s(from(z0)), cons(x1, from(x2))) -> c6(A__SEL(a__from(mark(z0)), a__from(mark(x2))), MARK(from(z0)))
   A__SEL(s(first(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x2))), MARK(first(z0, z1)))
   A__SEL(s(sel(z0, z1)), cons(x1, from(x2))) -> c6(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x2))), MARK(sel(z0, z1)))
   A__SEL(s(s(z0)), cons(x1, from(x2))) -> c6(A__SEL(s(mark(z0)), a__from(mark(x2))), MARK(s(z0)))
   A__SEL(s(x0), cons(x1, from(x2))) -> c6(MARK(x0))
   A__SEL(s(cons(z0, z1)), cons(x1, from(x2))) -> c6(MARK(cons(z0, z1)))
   A__SEL(s(0), cons(x1, from(x2))) -> c6(A__SEL(0, a__from(mark(x2))))
   A__SEL(s(x0), cons(x1, first(x2, from(z0)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__from(mark(z0)))), MARK(x0))
   A__SEL(s(x0), cons(x1, first(x2, first(z0, z1)))) -> c6(A__SEL(mark(x0), a__first(mark(x2), a__first(mark(z0), mark(z1)))), MARK(x0))
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   MARK(first(x0, cons(sel(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(a__sel(mark(z0), mark(z1)), x2)), MARK(cons(sel(z0, z1), x2)))
   MARK(first(x0, cons(cons(z0, z1), x2))) -> c11(A__FIRST(mark(x0), cons(cons(mark(z0), z1), x2)), MARK(cons(cons(z0, z1), x2)))
   MARK(first(x0, cons(s(z0), x2))) -> c11(A__FIRST(mark(x0), cons(s(mark(z0)), x2)), MARK(cons(s(z0), x2)))
   MARK(first(x0, cons(0, x2))) -> c11(A__FIRST(mark(x0), cons(0, x2)), MARK(cons(0, x2)))
   MARK(first(x0, cons(nil, x2))) -> c11(A__FIRST(mark(x0), cons(nil, x2)), MARK(cons(nil, x2)))
   MARK(first(from(z0), cons(x1, x2))) -> c11(A__FIRST(a__from(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(first(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__first(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(sel(z0, z1), cons(x1, x2))) -> c11(A__FIRST(a__sel(mark(z0), mark(z1)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(s(z0), cons(x1, x2))) -> c11(A__FIRST(s(mark(z0)), cons(mark(x1), x2)), MARK(cons(x1, x2)))
   MARK(first(x0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(cons(z0, z1), cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(0, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(nil, cons(x1, x2))) -> c11(MARK(cons(x1, x2)))
   MARK(first(from(from(z0)), x1)) -> c11(A__FIRST(a__from(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(first(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(sel(z0, z1)), x1)) -> c11(A__FIRST(a__from(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(from(cons(z0, z1)), x1)) -> c11(A__FIRST(a__from(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(from(s(z0)), x1)) -> c11(A__FIRST(a__from(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(from(0), x1)) -> c11(A__FIRST(a__from(0), mark(x1)), MARK(x1))
   MARK(first(from(nil), x1)) -> c11(A__FIRST(a__from(nil), mark(x1)), MARK(x1))
   MARK(first(from(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(from(x0), x1)) -> c11(MARK(x1))
   MARK(first(first(x0, from(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(first(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__first(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, s(z0)), x2)) -> c11(A__FIRST(a__first(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(first(x0, 0), x2)) -> c11(A__FIRST(a__first(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(first(x0, nil), x2)) -> c11(A__FIRST(a__first(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(first(from(z0), x1), x2)) -> c11(A__FIRST(a__first(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__first(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(s(z0), x1), x2)) -> c11(A__FIRST(a__first(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(0, x1), x2)) -> c11(A__FIRST(a__first(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(nil, x1), x2)) -> c11(A__FIRST(a__first(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(first(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(first(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(sel(x0, from(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__from(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, first(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__first(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, sel(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), a__sel(mark(z0), mark(z1))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, cons(z0, z1)), x2)) -> c11(A__FIRST(a__sel(mark(x0), cons(mark(z0), z1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, s(z0)), x2)) -> c11(A__FIRST(a__sel(mark(x0), s(mark(z0))), mark(x2)), MARK(x2))
   MARK(first(sel(x0, 0), x2)) -> c11(A__FIRST(a__sel(mark(x0), 0), mark(x2)), MARK(x2))
   MARK(first(sel(x0, nil), x2)) -> c11(A__FIRST(a__sel(mark(x0), nil), mark(x2)), MARK(x2))
   MARK(first(sel(from(z0), x1), x2)) -> c11(A__FIRST(a__sel(a__from(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(first(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__first(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(sel(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(a__sel(mark(z0), mark(z1)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(cons(z0, z1), x1), x2)) -> c11(A__FIRST(a__sel(cons(mark(z0), z1), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(s(z0), x1), x2)) -> c11(A__FIRST(a__sel(s(mark(z0)), mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(0, x1), x2)) -> c11(A__FIRST(a__sel(0, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(nil, x1), x2)) -> c11(A__FIRST(a__sel(nil, mark(x1)), mark(x2)), MARK(x2))
   MARK(first(sel(x0, x1), s(z0))) -> c11(MARK(s(z0)))
   MARK(first(sel(x0, x1), x2)) -> c11(MARK(x2))
   MARK(first(s(from(z0)), x1)) -> c11(A__FIRST(s(a__from(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(first(z0, z1)), x1)) -> c11(A__FIRST(s(a__first(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(sel(z0, z1)), x1)) -> c11(A__FIRST(s(a__sel(mark(z0), mark(z1))), mark(x1)), MARK(x1))
   MARK(first(s(cons(z0, z1)), x1)) -> c11(A__FIRST(s(cons(mark(z0), z1)), mark(x1)), MARK(x1))
   MARK(first(s(s(z0)), x1)) -> c11(A__FIRST(s(s(mark(z0))), mark(x1)), MARK(x1))
   MARK(first(s(0), x1)) -> c11(A__FIRST(s(0), mark(x1)), MARK(x1))
   MARK(first(s(nil), x1)) -> c11(A__FIRST(s(nil), mark(x1)), MARK(x1))
   MARK(first(s(x0), s(z0))) -> c11(MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(A__SEL(mark(x0), cons(mark(mark(x1)), from(s(mark(x1))))), MARK(x0))
   MARK(sel(x0, from(from(z0)))) -> c12(A__SEL(mark(x0), a__from(a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(first(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, from(cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__from(cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, from(s(z0)))) -> c12(A__SEL(mark(x0), a__from(s(mark(z0)))), MARK(x0))
   MARK(sel(x0, from(0))) -> c12(A__SEL(mark(x0), a__from(0)), MARK(x0))
   MARK(sel(x0, from(nil))) -> c12(A__SEL(mark(x0), a__from(nil)), MARK(x0))
   MARK(sel(from(z0), from(x1))) -> c12(A__SEL(a__from(mark(z0)), a__from(mark(x1))), MARK(from(z0)))
   MARK(sel(first(z0, z1), from(x1))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__from(mark(x1))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), from(x1))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__from(mark(x1))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), from(x1))) -> c12(A__SEL(s(mark(z0)), a__from(mark(x1))), MARK(s(z0)))
   MARK(sel(x0, from(x1))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), from(x1))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, from(x1))) -> c12(A__SEL(0, a__from(mark(x1))))
   MARK(sel(x0, first(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, first(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, first(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__first(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, first(x1, 0))) -> c12(A__SEL(mark(x0), a__first(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, first(x1, nil))) -> c12(A__SEL(mark(x0), a__first(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, first(from(z0), x2))) -> c12(A__SEL(mark(x0), a__first(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__first(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, first(s(z0), x2))) -> c12(A__SEL(mark(x0), a__first(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, first(0, x2))) -> c12(A__SEL(mark(x0), a__first(0, mark(x2))), MARK(x0))
   MARK(sel(x0, first(nil, x2))) -> c12(A__SEL(mark(x0), a__first(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), first(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__first(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), first(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), first(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__first(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), first(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__first(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, first(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), first(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, first(x1, x2))) -> c12(A__SEL(0, a__first(mark(x1), mark(x2))))
   MARK(sel(x0, sel(x1, from(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__from(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, first(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__first(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, sel(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), a__sel(mark(z0), mark(z1)))), MARK(x0))
   MARK(sel(x0, sel(x1, cons(z0, z1)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), cons(mark(z0), z1))), MARK(x0))
   MARK(sel(x0, sel(x1, s(z0)))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), s(mark(z0)))), MARK(x0))
   MARK(sel(x0, sel(x1, 0))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), 0)), MARK(x0))
   MARK(sel(x0, sel(x1, nil))) -> c12(A__SEL(mark(x0), a__sel(mark(x1), nil)), MARK(x0))
   MARK(sel(x0, sel(from(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(a__from(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(first(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__first(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(sel(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(a__sel(mark(z0), mark(z1)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(cons(z0, z1), x2))) -> c12(A__SEL(mark(x0), a__sel(cons(mark(z0), z1), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(s(z0), x2))) -> c12(A__SEL(mark(x0), a__sel(s(mark(z0)), mark(x2))), MARK(x0))
   MARK(sel(x0, sel(0, x2))) -> c12(A__SEL(mark(x0), a__sel(0, mark(x2))), MARK(x0))
   MARK(sel(x0, sel(nil, x2))) -> c12(A__SEL(mark(x0), a__sel(nil, mark(x2))), MARK(x0))
   MARK(sel(from(z0), sel(x1, x2))) -> c12(A__SEL(a__from(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(from(z0)))
   MARK(sel(first(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__first(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(first(z0, z1)))
   MARK(sel(sel(z0, z1), sel(x1, x2))) -> c12(A__SEL(a__sel(mark(z0), mark(z1)), a__sel(mark(x1), mark(x2))), MARK(sel(z0, z1)))
   MARK(sel(s(z0), sel(x1, x2))) -> c12(A__SEL(s(mark(z0)), a__sel(mark(x1), mark(x2))), MARK(s(z0)))
   MARK(sel(x0, sel(x1, x2))) -> c12(MARK(x0))
   MARK(sel(cons(z0, z1), sel(x1, x2))) -> c12(MARK(cons(z0, z1)))
   MARK(sel(0, sel(x1, x2))) -> c12(A__SEL(0, a__sel(mark(x1), mark(x2))))
K tuples:none
Defined Rule Symbols:   a__from_1, a__first_2, a__sel_2, mark_1

Defined Pair Symbols:   A__FROM_1, A__FIRST_2, A__SEL_2, MARK_1

Compound Symbols:   c_1, c3_1, c5_1, c9_2, c14_1, c15_1, c6_1, c7_1, c10_1, c11_1, c12_2, c12_1, c13_2, c13_1, c6_2, c7_2, c10_2, c11_2