nthtail n l cond ge n length l n l cond true n l l cond false n l tail nthtail s n l tail nil nil tail cons x l l length nil 0 length cons x l s length l ge u 0 true ge 0 s v false ge s u s v ge u v nthtail 2 cond 3 ge 2 length 1 true 0 false 0 tail 1 s 1 nil 0 cons 2 0 0 FULL ./TRS/SchneiderKamp/trs/cade16.trs