MAYBE
MAYBE
TRS:
 {
    sum(0()) -> 0(),
   sum(s(x)) -> +(sum(x), s(x)),
   sum1(0()) -> 0(),
  sum1(s(x)) -> s(+(sum1(x), +(x, x)))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
      sum(0()) -> 0(),
     sum(s(x)) -> +(sum(x), s(x)),
     sum1(0()) -> 0(),
    sum1(s(x)) -> s(+(sum1(x), +(x, x)))
   }
  Fail