sort nil nil sort cons x y insert x sort y insert x nil cons x nil insert x cons v w choose x cons v w x v choose x cons v w y 0 cons x cons v w choose x cons v w 0 s z cons v insert x w choose x cons v w s y s z choose x cons v w y z sort 1 nil 0 cons 2 insert 2 choose 4 0 0 s 1 FULL ./TRS/D33/32.trs