(member 'a '(a b c d e f g h i j k l m n o p q r s t u v))
(member 'v '(a b c d e f g h i j k l m n o p q r s t u v))
(member 'p '(a b c d e f g h i j k l m n o p q r s t u v))
(member 'p '(a b c d e f g h i j k l m n o q r s t u v))

