MAYBE
MAYBE
TRS:
 {
                from(X) -> cons(X, n__from(s(X))),
                from(X) -> n__from(X),
  sel(s(X), cons(Y, Z)) -> sel(X, activate(Z)),
   sel(0(), cons(X, Y)) -> X,
            activate(X) -> X,
   activate(n__from(X)) -> from(X)
 }
 DUP: We consider a duplicating system.
  Trs:
   {
                  from(X) -> cons(X, n__from(s(X))),
                  from(X) -> n__from(X),
    sel(s(X), cons(Y, Z)) -> sel(X, activate(Z)),
     sel(0(), cons(X, Y)) -> X,
              activate(X) -> X,
     activate(n__from(X)) -> from(X)
   }
  Fail