YES

We show the termination of the TRS R:

  a__zeros() -> cons(|0|(),zeros())
  a__U11(tt(),L) -> s(a__length(mark(L)))
  a__and(tt(),X) -> mark(X)
  a__isNat(|0|()) -> tt()
  a__isNat(length(V1)) -> a__isNatList(V1)
  a__isNat(s(V1)) -> a__isNat(V1)
  a__isNatIList(V) -> a__isNatList(V)
  a__isNatIList(zeros()) -> tt()
  a__isNatIList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatIList(V2))
  a__isNatList(nil()) -> tt()
  a__isNatList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatList(V2))
  a__length(nil()) -> |0|()
  a__length(cons(N,L)) -> a__U11(a__and(a__isNatList(L),isNat(N)),L)
  mark(zeros()) -> a__zeros()
  mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
  mark(length(X)) -> a__length(mark(X))
  mark(and(X1,X2)) -> a__and(mark(X1),X2)
  mark(isNat(X)) -> a__isNat(X)
  mark(isNatList(X)) -> a__isNatList(X)
  mark(isNatIList(X)) -> a__isNatIList(X)
  mark(cons(X1,X2)) -> cons(mark(X1),X2)
  mark(|0|()) -> |0|()
  mark(tt()) -> tt()
  mark(s(X)) -> s(mark(X))
  mark(nil()) -> nil()
  a__zeros() -> zeros()
  a__U11(X1,X2) -> U11(X1,X2)
  a__length(X) -> length(X)
  a__and(X1,X2) -> and(X1,X2)
  a__isNat(X) -> isNat(X)
  a__isNatList(X) -> isNatList(X)
  a__isNatIList(X) -> isNatIList(X)

-- SCC decomposition.

Consider the dependency pair problem (P, R), where P consists of

p1: a__U11#(tt(),L) -> a__length#(mark(L))
p2: a__U11#(tt(),L) -> mark#(L)
p3: a__and#(tt(),X) -> mark#(X)
p4: a__isNat#(length(V1)) -> a__isNatList#(V1)
p5: a__isNat#(s(V1)) -> a__isNat#(V1)
p6: a__isNatIList#(V) -> a__isNatList#(V)
p7: a__isNatIList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatIList(V2))
p8: a__isNatIList#(cons(V1,V2)) -> a__isNat#(V1)
p9: a__isNatList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatList(V2))
p10: a__isNatList#(cons(V1,V2)) -> a__isNat#(V1)
p11: a__length#(cons(N,L)) -> a__U11#(a__and(a__isNatList(L),isNat(N)),L)
p12: a__length#(cons(N,L)) -> a__and#(a__isNatList(L),isNat(N))
p13: a__length#(cons(N,L)) -> a__isNatList#(L)
p14: mark#(zeros()) -> a__zeros#()
p15: mark#(U11(X1,X2)) -> a__U11#(mark(X1),X2)
p16: mark#(U11(X1,X2)) -> mark#(X1)
p17: mark#(length(X)) -> a__length#(mark(X))
p18: mark#(length(X)) -> mark#(X)
p19: mark#(and(X1,X2)) -> a__and#(mark(X1),X2)
p20: mark#(and(X1,X2)) -> mark#(X1)
p21: mark#(isNat(X)) -> a__isNat#(X)
p22: mark#(isNatList(X)) -> a__isNatList#(X)
p23: mark#(isNatIList(X)) -> a__isNatIList#(X)
p24: mark#(cons(X1,X2)) -> mark#(X1)
p25: mark#(s(X)) -> mark#(X)

and R consists of:

r1: a__zeros() -> cons(|0|(),zeros())
r2: a__U11(tt(),L) -> s(a__length(mark(L)))
r3: a__and(tt(),X) -> mark(X)
r4: a__isNat(|0|()) -> tt()
r5: a__isNat(length(V1)) -> a__isNatList(V1)
r6: a__isNat(s(V1)) -> a__isNat(V1)
r7: a__isNatIList(V) -> a__isNatList(V)
r8: a__isNatIList(zeros()) -> tt()
r9: a__isNatIList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatIList(V2))
r10: a__isNatList(nil()) -> tt()
r11: a__isNatList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatList(V2))
r12: a__length(nil()) -> |0|()
r13: a__length(cons(N,L)) -> a__U11(a__and(a__isNatList(L),isNat(N)),L)
r14: mark(zeros()) -> a__zeros()
r15: mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
r16: mark(length(X)) -> a__length(mark(X))
r17: mark(and(X1,X2)) -> a__and(mark(X1),X2)
r18: mark(isNat(X)) -> a__isNat(X)
r19: mark(isNatList(X)) -> a__isNatList(X)
r20: mark(isNatIList(X)) -> a__isNatIList(X)
r21: mark(cons(X1,X2)) -> cons(mark(X1),X2)
r22: mark(|0|()) -> |0|()
r23: mark(tt()) -> tt()
r24: mark(s(X)) -> s(mark(X))
r25: mark(nil()) -> nil()
r26: a__zeros() -> zeros()
r27: a__U11(X1,X2) -> U11(X1,X2)
r28: a__length(X) -> length(X)
r29: a__and(X1,X2) -> and(X1,X2)
r30: a__isNat(X) -> isNat(X)
r31: a__isNatList(X) -> isNatList(X)
r32: a__isNatIList(X) -> isNatIList(X)

The estimated dependency graph contains the following SCCs:

  {p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p15, p16, p17, p18, p19, p20, p21, p22, p23, p24, p25}


-- Reduction pair.

Consider the dependency pair problem (P, R), where P consists of

p1: a__U11#(tt(),L) -> a__length#(mark(L))
p2: a__length#(cons(N,L)) -> a__isNatList#(L)
p3: a__isNatList#(cons(V1,V2)) -> a__isNat#(V1)
p4: a__isNat#(s(V1)) -> a__isNat#(V1)
p5: a__isNat#(length(V1)) -> a__isNatList#(V1)
p6: a__isNatList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatList(V2))
p7: a__and#(tt(),X) -> mark#(X)
p8: mark#(s(X)) -> mark#(X)
p9: mark#(cons(X1,X2)) -> mark#(X1)
p10: mark#(isNatIList(X)) -> a__isNatIList#(X)
p11: a__isNatIList#(cons(V1,V2)) -> a__isNat#(V1)
p12: a__isNatIList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatIList(V2))
p13: a__isNatIList#(V) -> a__isNatList#(V)
p14: mark#(isNatList(X)) -> a__isNatList#(X)
p15: mark#(isNat(X)) -> a__isNat#(X)
p16: mark#(and(X1,X2)) -> mark#(X1)
p17: mark#(and(X1,X2)) -> a__and#(mark(X1),X2)
p18: mark#(length(X)) -> mark#(X)
p19: mark#(length(X)) -> a__length#(mark(X))
p20: a__length#(cons(N,L)) -> a__and#(a__isNatList(L),isNat(N))
p21: a__length#(cons(N,L)) -> a__U11#(a__and(a__isNatList(L),isNat(N)),L)
p22: a__U11#(tt(),L) -> mark#(L)
p23: mark#(U11(X1,X2)) -> mark#(X1)
p24: mark#(U11(X1,X2)) -> a__U11#(mark(X1),X2)

and R consists of:

r1: a__zeros() -> cons(|0|(),zeros())
r2: a__U11(tt(),L) -> s(a__length(mark(L)))
r3: a__and(tt(),X) -> mark(X)
r4: a__isNat(|0|()) -> tt()
r5: a__isNat(length(V1)) -> a__isNatList(V1)
r6: a__isNat(s(V1)) -> a__isNat(V1)
r7: a__isNatIList(V) -> a__isNatList(V)
r8: a__isNatIList(zeros()) -> tt()
r9: a__isNatIList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatIList(V2))
r10: a__isNatList(nil()) -> tt()
r11: a__isNatList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatList(V2))
r12: a__length(nil()) -> |0|()
r13: a__length(cons(N,L)) -> a__U11(a__and(a__isNatList(L),isNat(N)),L)
r14: mark(zeros()) -> a__zeros()
r15: mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
r16: mark(length(X)) -> a__length(mark(X))
r17: mark(and(X1,X2)) -> a__and(mark(X1),X2)
r18: mark(isNat(X)) -> a__isNat(X)
r19: mark(isNatList(X)) -> a__isNatList(X)
r20: mark(isNatIList(X)) -> a__isNatIList(X)
r21: mark(cons(X1,X2)) -> cons(mark(X1),X2)
r22: mark(|0|()) -> |0|()
r23: mark(tt()) -> tt()
r24: mark(s(X)) -> s(mark(X))
r25: mark(nil()) -> nil()
r26: a__zeros() -> zeros()
r27: a__U11(X1,X2) -> U11(X1,X2)
r28: a__length(X) -> length(X)
r29: a__and(X1,X2) -> and(X1,X2)
r30: a__isNat(X) -> isNat(X)
r31: a__isNatList(X) -> isNatList(X)
r32: a__isNatIList(X) -> isNatIList(X)

The set of usable rules consists of

  r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15, r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32

Take the reduction pair:

  lexicographic combination of reduction pairs:
  
    1. matrix interpretations:
    
      carrier: N^2
      order: standard order
      interpretations:
        a__U11#_A(x1,x2) = ((0,1),(0,1)) x2 + (2,0)
        tt_A() = (0,0)
        a__length#_A(x1) = ((1,0),(1,0)) x1 + (2,0)
        mark_A(x1) = ((0,1),(1,1)) x1
        cons_A(x1,x2) = ((0,1),(1,1)) x1 + ((0,1),(1,1)) x2
        a__isNatList#_A(x1) = (0,0)
        a__isNat#_A(x1) = (0,0)
        s_A(x1) = x1
        length_A(x1) = x1 + (1,3)
        a__and#_A(x1,x2) = ((0,0),(1,0)) x1 + ((0,1),(0,1)) x2
        a__isNat_A(x1) = (0,0)
        isNatList_A(x1) = (0,0)
        mark#_A(x1) = ((0,1),(0,1)) x1
        isNatIList_A(x1) = (1,2)
        a__isNatIList#_A(x1) = (2,2)
        isNat_A(x1) = (0,0)
        and_A(x1,x2) = ((0,1),(1,1)) x1 + ((0,1),(1,1)) x2
        a__isNatList_A(x1) = (0,0)
        a__and_A(x1,x2) = ((0,1),(1,1)) x1 + ((0,1),(1,1)) x2
        U11_A(x1,x2) = x1 + ((0,0),(1,1)) x2 + (1,3)
        a__zeros_A() = (1,1)
        |0|_A() = (0,0)
        zeros_A() = (0,1)
        a__U11_A(x1,x2) = x1 + ((0,1),(1,1)) x2 + (2,3)
        a__length_A(x1) = x1 + (2,3)
        a__isNatIList_A(x1) = (2,3)
        nil_A() = (1,2)
    
    2. matrix interpretations:
    
      carrier: N^2
      order: standard order
      interpretations:
        a__U11#_A(x1,x2) = (1,1)
        tt_A() = (0,0)
        a__length#_A(x1) = ((0,1),(0,0)) x1 + (1,1)
        mark_A(x1) = (0,0)
        cons_A(x1,x2) = (0,0)
        a__isNatList#_A(x1) = (0,0)
        a__isNat#_A(x1) = (0,0)
        s_A(x1) = (0,0)
        length_A(x1) = (1,2)
        a__and#_A(x1,x2) = (0,0)
        a__isNat_A(x1) = (0,0)
        isNatList_A(x1) = (0,0)
        mark#_A(x1) = (0,0)
        isNatIList_A(x1) = (0,0)
        a__isNatIList#_A(x1) = (0,0)
        isNat_A(x1) = (0,0)
        and_A(x1,x2) = (0,0)
        a__isNatList_A(x1) = (0,0)
        a__and_A(x1,x2) = (0,0)
        U11_A(x1,x2) = (2,0)
        a__zeros_A() = (0,0)
        |0|_A() = (0,0)
        zeros_A() = (1,1)
        a__U11_A(x1,x2) = (1,1)
        a__length_A(x1) = (2,1)
        a__isNatIList_A(x1) = (0,0)
        nil_A() = (0,1)
    

The next rules are strictly ordered:

  p2, p11, p13, p18, p19, p20, p22, p23, p24

We remove them from the problem.

-- SCC decomposition.

Consider the dependency pair problem (P, R), where P consists of

p1: a__U11#(tt(),L) -> a__length#(mark(L))
p2: a__isNatList#(cons(V1,V2)) -> a__isNat#(V1)
p3: a__isNat#(s(V1)) -> a__isNat#(V1)
p4: a__isNat#(length(V1)) -> a__isNatList#(V1)
p5: a__isNatList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatList(V2))
p6: a__and#(tt(),X) -> mark#(X)
p7: mark#(s(X)) -> mark#(X)
p8: mark#(cons(X1,X2)) -> mark#(X1)
p9: mark#(isNatIList(X)) -> a__isNatIList#(X)
p10: a__isNatIList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatIList(V2))
p11: mark#(isNatList(X)) -> a__isNatList#(X)
p12: mark#(isNat(X)) -> a__isNat#(X)
p13: mark#(and(X1,X2)) -> mark#(X1)
p14: mark#(and(X1,X2)) -> a__and#(mark(X1),X2)
p15: a__length#(cons(N,L)) -> a__U11#(a__and(a__isNatList(L),isNat(N)),L)

and R consists of:

r1: a__zeros() -> cons(|0|(),zeros())
r2: a__U11(tt(),L) -> s(a__length(mark(L)))
r3: a__and(tt(),X) -> mark(X)
r4: a__isNat(|0|()) -> tt()
r5: a__isNat(length(V1)) -> a__isNatList(V1)
r6: a__isNat(s(V1)) -> a__isNat(V1)
r7: a__isNatIList(V) -> a__isNatList(V)
r8: a__isNatIList(zeros()) -> tt()
r9: a__isNatIList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatIList(V2))
r10: a__isNatList(nil()) -> tt()
r11: a__isNatList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatList(V2))
r12: a__length(nil()) -> |0|()
r13: a__length(cons(N,L)) -> a__U11(a__and(a__isNatList(L),isNat(N)),L)
r14: mark(zeros()) -> a__zeros()
r15: mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
r16: mark(length(X)) -> a__length(mark(X))
r17: mark(and(X1,X2)) -> a__and(mark(X1),X2)
r18: mark(isNat(X)) -> a__isNat(X)
r19: mark(isNatList(X)) -> a__isNatList(X)
r20: mark(isNatIList(X)) -> a__isNatIList(X)
r21: mark(cons(X1,X2)) -> cons(mark(X1),X2)
r22: mark(|0|()) -> |0|()
r23: mark(tt()) -> tt()
r24: mark(s(X)) -> s(mark(X))
r25: mark(nil()) -> nil()
r26: a__zeros() -> zeros()
r27: a__U11(X1,X2) -> U11(X1,X2)
r28: a__length(X) -> length(X)
r29: a__and(X1,X2) -> and(X1,X2)
r30: a__isNat(X) -> isNat(X)
r31: a__isNatList(X) -> isNatList(X)
r32: a__isNatIList(X) -> isNatIList(X)

The estimated dependency graph contains the following SCCs:

  {p1, p15}
  {p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14}


-- Reduction pair.

Consider the dependency pair problem (P, R), where P consists of

p1: a__U11#(tt(),L) -> a__length#(mark(L))
p2: a__length#(cons(N,L)) -> a__U11#(a__and(a__isNatList(L),isNat(N)),L)

and R consists of:

r1: a__zeros() -> cons(|0|(),zeros())
r2: a__U11(tt(),L) -> s(a__length(mark(L)))
r3: a__and(tt(),X) -> mark(X)
r4: a__isNat(|0|()) -> tt()
r5: a__isNat(length(V1)) -> a__isNatList(V1)
r6: a__isNat(s(V1)) -> a__isNat(V1)
r7: a__isNatIList(V) -> a__isNatList(V)
r8: a__isNatIList(zeros()) -> tt()
r9: a__isNatIList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatIList(V2))
r10: a__isNatList(nil()) -> tt()
r11: a__isNatList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatList(V2))
r12: a__length(nil()) -> |0|()
r13: a__length(cons(N,L)) -> a__U11(a__and(a__isNatList(L),isNat(N)),L)
r14: mark(zeros()) -> a__zeros()
r15: mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
r16: mark(length(X)) -> a__length(mark(X))
r17: mark(and(X1,X2)) -> a__and(mark(X1),X2)
r18: mark(isNat(X)) -> a__isNat(X)
r19: mark(isNatList(X)) -> a__isNatList(X)
r20: mark(isNatIList(X)) -> a__isNatIList(X)
r21: mark(cons(X1,X2)) -> cons(mark(X1),X2)
r22: mark(|0|()) -> |0|()
r23: mark(tt()) -> tt()
r24: mark(s(X)) -> s(mark(X))
r25: mark(nil()) -> nil()
r26: a__zeros() -> zeros()
r27: a__U11(X1,X2) -> U11(X1,X2)
r28: a__length(X) -> length(X)
r29: a__and(X1,X2) -> and(X1,X2)
r30: a__isNat(X) -> isNat(X)
r31: a__isNatList(X) -> isNatList(X)
r32: a__isNatIList(X) -> isNatIList(X)

The set of usable rules consists of

  r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15, r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32

Take the reduction pair:

  lexicographic combination of reduction pairs:
  
    1. matrix interpretations:
    
      carrier: N^2
      order: standard order
      interpretations:
        a__U11#_A(x1,x2) = x1 + ((1,1),(0,0)) x2 + (2,0)
        tt_A() = (16,1)
        a__length#_A(x1) = ((1,1),(0,0)) x1
        mark_A(x1) = x1 + (17,0)
        cons_A(x1,x2) = x1 + ((1,1),(1,0)) x2 + (15,0)
        a__and_A(x1,x2) = ((1,1),(0,0)) x1 + ((1,1),(0,1)) x2 + (1,0)
        a__isNatList_A(x1) = x1 + (7,1)
        isNat_A(x1) = x1 + (1,1)
        a__zeros_A() = (17,1)
        |0|_A() = (0,1)
        zeros_A() = (0,1)
        a__U11_A(x1,x2) = x1 + ((1,1),(1,0)) x2 + (4,1)
        s_A(x1) = x1 + (1,1)
        a__length_A(x1) = ((1,1),(0,1)) x1 + (1,1)
        a__isNat_A(x1) = x1 + (17,1)
        length_A(x1) = ((1,1),(0,1)) x1 + (1,1)
        a__isNatIList_A(x1) = x1 + (17,1)
        isNatIList_A(x1) = x1 + (1,1)
        nil_A() = (10,1)
        U11_A(x1,x2) = x1 + ((1,1),(1,0)) x2 + (4,1)
        isNatList_A(x1) = x1 + (1,1)
        and_A(x1,x2) = ((1,1),(0,0)) x1 + ((1,1),(0,1)) x2 + (1,0)
    
    2. matrix interpretations:
    
      carrier: N^2
      order: standard order
      interpretations:
        a__U11#_A(x1,x2) = ((1,1),(0,0)) x2
        tt_A() = (5,2)
        a__length#_A(x1) = (1,0)
        mark_A(x1) = ((0,1),(0,0)) x1 + (5,4)
        cons_A(x1,x2) = (0,1)
        a__and_A(x1,x2) = (4,3)
        a__isNatList_A(x1) = (3,1)
        isNat_A(x1) = ((0,0),(1,1)) x1 + (5,2)
        a__zeros_A() = (1,0)
        |0|_A() = (1,1)
        zeros_A() = (2,1)
        a__U11_A(x1,x2) = ((0,1),(0,0)) x1 + (0,3)
        s_A(x1) = (3,4)
        a__length_A(x1) = (2,0)
        a__isNat_A(x1) = (4,1)
        length_A(x1) = (1,0)
        a__isNatIList_A(x1) = (2,0)
        isNatIList_A(x1) = (3,1)
        nil_A() = (1,1)
        U11_A(x1,x2) = ((0,1),(0,0)) x1
        isNatList_A(x1) = ((1,1),(0,1)) x1 + (4,2)
        and_A(x1,x2) = (1,0)
    

The next rules are strictly ordered:

  p1, p2

We remove them from the problem.  Then no dependency pair remains.

-- Reduction pair.

Consider the dependency pair problem (P, R), where P consists of

p1: a__isNatList#(cons(V1,V2)) -> a__isNat#(V1)
p2: a__isNat#(length(V1)) -> a__isNatList#(V1)
p3: a__isNatList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatList(V2))
p4: a__and#(tt(),X) -> mark#(X)
p5: mark#(and(X1,X2)) -> a__and#(mark(X1),X2)
p6: mark#(and(X1,X2)) -> mark#(X1)
p7: mark#(isNat(X)) -> a__isNat#(X)
p8: a__isNat#(s(V1)) -> a__isNat#(V1)
p9: mark#(isNatList(X)) -> a__isNatList#(X)
p10: mark#(isNatIList(X)) -> a__isNatIList#(X)
p11: a__isNatIList#(cons(V1,V2)) -> a__and#(a__isNat(V1),isNatIList(V2))
p12: mark#(cons(X1,X2)) -> mark#(X1)
p13: mark#(s(X)) -> mark#(X)

and R consists of:

r1: a__zeros() -> cons(|0|(),zeros())
r2: a__U11(tt(),L) -> s(a__length(mark(L)))
r3: a__and(tt(),X) -> mark(X)
r4: a__isNat(|0|()) -> tt()
r5: a__isNat(length(V1)) -> a__isNatList(V1)
r6: a__isNat(s(V1)) -> a__isNat(V1)
r7: a__isNatIList(V) -> a__isNatList(V)
r8: a__isNatIList(zeros()) -> tt()
r9: a__isNatIList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatIList(V2))
r10: a__isNatList(nil()) -> tt()
r11: a__isNatList(cons(V1,V2)) -> a__and(a__isNat(V1),isNatList(V2))
r12: a__length(nil()) -> |0|()
r13: a__length(cons(N,L)) -> a__U11(a__and(a__isNatList(L),isNat(N)),L)
r14: mark(zeros()) -> a__zeros()
r15: mark(U11(X1,X2)) -> a__U11(mark(X1),X2)
r16: mark(length(X)) -> a__length(mark(X))
r17: mark(and(X1,X2)) -> a__and(mark(X1),X2)
r18: mark(isNat(X)) -> a__isNat(X)
r19: mark(isNatList(X)) -> a__isNatList(X)
r20: mark(isNatIList(X)) -> a__isNatIList(X)
r21: mark(cons(X1,X2)) -> cons(mark(X1),X2)
r22: mark(|0|()) -> |0|()
r23: mark(tt()) -> tt()
r24: mark(s(X)) -> s(mark(X))
r25: mark(nil()) -> nil()
r26: a__zeros() -> zeros()
r27: a__U11(X1,X2) -> U11(X1,X2)
r28: a__length(X) -> length(X)
r29: a__and(X1,X2) -> and(X1,X2)
r30: a__isNat(X) -> isNat(X)
r31: a__isNatList(X) -> isNatList(X)
r32: a__isNatIList(X) -> isNatIList(X)

The set of usable rules consists of

  r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15, r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32

Take the reduction pair:

  lexicographic combination of reduction pairs:
  
    1. matrix interpretations:
    
      carrier: N^2
      order: standard order
      interpretations:
        a__isNatList#_A(x1) = x1 + (26,0)
        cons_A(x1,x2) = x1 + ((1,1),(1,0)) x2 + (19,0)
        a__isNat#_A(x1) = x1 + (26,0)
        length_A(x1) = ((1,1),(0,1)) x1 + (1,1)
        a__and#_A(x1,x2) = x1 + x2
        a__isNat_A(x1) = x1 + (24,1)
        isNatList_A(x1) = x1 + (5,0)
        tt_A() = (23,0)
        mark#_A(x1) = x1 + (22,0)
        and_A(x1,x2) = x1 + ((1,1),(0,1)) x2 + (1,0)
        mark_A(x1) = x1 + (21,0)
        isNat_A(x1) = x1 + (4,1)
        s_A(x1) = x1 + (1,1)
        isNatIList_A(x1) = x1 + (1,0)
        a__isNatIList#_A(x1) = x1 + (22,0)
        a__zeros_A() = (21,1)
        |0|_A() = (0,1)
        zeros_A() = (1,1)
        a__U11_A(x1,x2) = x1 + ((1,1),(1,0)) x2 + (1,1)
        a__length_A(x1) = ((1,1),(0,1)) x1 + (1,1)
        a__and_A(x1,x2) = x1 + ((1,1),(0,1)) x2 + (1,0)
        a__isNatIList_A(x1) = x1 + (22,0)
        a__isNatList_A(x1) = x1 + (12,0)
        nil_A() = (11,0)
        U11_A(x1,x2) = x1 + ((1,1),(1,0)) x2 + (1,1)
    
    2. matrix interpretations:
    
      carrier: N^2
      order: standard order
      interpretations:
        a__isNatList#_A(x1) = ((1,1),(0,0)) x1 + (2,1)
        cons_A(x1,x2) = x1 + ((1,1),(1,1)) x2 + (1,18)
        a__isNat#_A(x1) = x1
        length_A(x1) = x1 + (1,1)
        a__and#_A(x1,x2) = x1 + ((1,1),(0,0)) x2 + (0,1)
        a__isNat_A(x1) = (1,1)
        isNatList_A(x1) = ((0,1),(1,1)) x1
        tt_A() = (4,0)
        mark#_A(x1) = ((1,1),(0,0)) x1 + (3,1)
        and_A(x1,x2) = x1 + ((1,1),(1,1)) x2 + (1,4)
        mark_A(x1) = ((0,1),(0,1)) x1 + (6,6)
        isNat_A(x1) = ((0,0),(1,1)) x1 + (2,1)
        s_A(x1) = x1 + (2,3)
        isNatIList_A(x1) = ((1,1),(1,1)) x1 + (1,15)
        a__isNatIList#_A(x1) = (18,2)
        a__zeros_A() = (10,24)
        |0|_A() = (5,2)
        zeros_A() = (1,3)
        a__U11_A(x1,x2) = x1 + (3,10)
        a__length_A(x1) = x1 + (2,1)
        a__and_A(x1,x2) = x1 + ((1,1),(1,1)) x2 + (3,4)
        a__isNatIList_A(x1) = ((1,1),(0,0)) x1 + (0,21)
        a__isNatList_A(x1) = ((0,1),(0,1)) x1 + (5,2)
        nil_A() = (1,0)
        U11_A(x1,x2) = x1 + (3,10)
    

The next rules are strictly ordered:

  p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13

We remove them from the problem.  Then no dependency pair remains.