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