MAYBE
MAYBE
TRS:
 {
      minus(x, 0()) -> x,
  minus(s(x), s(y)) -> minus(x, y),
             f(0()) -> s(0()),
            f(s(x)) -> minus(s(x), g(f(x))),
             g(0()) -> 0(),
            g(s(x)) -> minus(s(x), f(g(x)))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
        minus(x, 0()) -> x,
    minus(s(x), s(y)) -> minus(x, y),
               f(0()) -> s(0()),
              f(s(x)) -> minus(s(x), g(f(x))),
               g(0()) -> 0(),
              g(s(x)) -> minus(s(x), f(g(x)))
   }
  Fail