MAYBE
MAYBE
TRS:
 {
  2nd(cons(X, cons(Y, Z))) -> Y,
                   from(X) -> cons(X, from(s(X)))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
    2nd(cons(X, cons(Y, Z))) -> Y,
                     from(X) -> cons(X, from(s(X)))
   }
  Fail