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