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