TRS: {a__2nd(cons1(X, cons(Y, Z))) -> mark(Y), a__2nd(cons(X, X1)) -> a__2nd(cons1(mark(X), mark(X1))), a__from(X) -> cons(mark(X), from(s(X))), mark(2nd(X)) -> a__2nd(mark(X)), mark(from(X)) -> a__from(mark(X)), mark(cons(X1, X2)) -> cons(mark(X1), X2), mark(s(X)) -> s(mark(X)), mark(cons1(X1, X2)) -> cons1(mark(X1), mark(X2)), a__2nd(X) -> 2nd(X), a__from(X) -> from(X)} Fail