MAYBE
MAYBE
TRS:
 {
   cond(true(), n, l) -> l,
  cond(false(), n, l) -> tail(nthtail(s(n), l)),
           ge(u, 0()) -> true(),
       ge(s(u), s(v)) -> ge(u, v),
        ge(0(), s(v)) -> false(),
        length(nil()) -> 0(),
   length(cons(x, l)) -> s(length(l)),
        nthtail(n, l) -> cond(ge(n, length(l)), n, l),
          tail(nil()) -> nil(),
     tail(cons(x, l)) -> l
 }
 DUP: We consider a duplicating system.
  Trs:
   {
     cond(true(), n, l) -> l,
    cond(false(), n, l) -> tail(nthtail(s(n), l)),
             ge(u, 0()) -> true(),
         ge(s(u), s(v)) -> ge(u, v),
          ge(0(), s(v)) -> false(),
          length(nil()) -> 0(),
     length(cons(x, l)) -> s(length(l)),
          nthtail(n, l) -> cond(ge(n, length(l)), n, l),
            tail(nil()) -> nil(),
       tail(cons(x, l)) -> l
   }
  Fail