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