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