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