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