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