TIMEOUT
MAYBE
Trs:
 {         int(0(), s(y)) -> cons(0(), int(s(0()), s(y))),
           int(s(x), 0()) -> nil(),
          int(s(x), s(y)) -> intlist(int(x, y)),
                int(x, x) -> cons(x, nil()),
           intlist(nil()) -> nil(),
  intlist(cons(x, nil())) -> cons(s(x), nil()),
      intlist(cons(x, y)) -> cons(s(x), intlist(y))}
 Open