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