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