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