MAYBE
Trs:
 {       le(0(), y) -> true(),
      le(s(x), 0()) -> false(),
     le(s(x), s(y)) -> le(x, y),
  minus(s(x), s(y)) -> minus(x, y),
      minus(x, 0()) -> x,
    quot(0(), s(y)) -> 0(),
   quot(s(x), s(y)) -> s(quot(minus(s(x), s(y)), s(y)))}
 Comment:
  We consider a duplicating trs.
  FAIL:
   Open