MAYBE
MAYBE
TRS:
 {
   f(a(), a()) -> f(a(), b()),
   f(a(), b()) -> f(s(a()), c()),
  f(s(X), c()) -> f(X, c()),
   f(c(), c()) -> f(a(), a())
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
     f(a(), a()) -> f(a(), b()),
     f(a(), b()) -> f(s(a()), c()),
    f(s(X), c()) -> f(X, c()),
     f(c(), c()) -> f(a(), a())
   }
  Fail