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