Input TRS:
    1: active(zeros()) -> mark(cons(0(),zeros()))
    2: active(and(tt(),X)) -> mark(X)
    3: active(length(nil())) -> mark(0())
    4: active(length(cons(N,L))) -> mark(s(length(L)))
    5: mark(zeros()) -> active(zeros())
    6: mark(cons(X1,X2)) -> active(cons(mark(X1),X2))
    7: mark(0()) -> active(0())
    8: mark(and(X1,X2)) -> active(and(mark(X1),X2))
    9: mark(tt()) -> active(tt())
    10: mark(length(X)) -> active(length(mark(X)))
    11: mark(nil()) -> active(nil())
    12: mark(s(X)) -> active(s(mark(X)))
    13: cons(mark(X1),X2) -> cons(X1,X2)
    14: cons(X1,mark(X2)) -> cons(X1,X2)
    15: cons(active(X1),X2) -> cons(X1,X2)
    16: cons(X1,active(X2)) -> cons(X1,X2)
    17: and(mark(X1),X2) -> and(X1,X2)
    18: and(X1,mark(X2)) -> and(X1,X2)
    19: and(active(X1),X2) -> and(X1,X2)
    20: and(X1,active(X2)) -> and(X1,X2)
    21: length(mark(X)) -> length(X)
    22: length(active(X)) -> length(X)
    23: s(mark(X)) -> s(X)
    24: s(active(X)) -> s(X)
Number of Rules: 24
Direct QWPOS(mSum) ... failed.