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