Created page with "{{Built-in|Membership|∊}}, also called '''Member Of''' or '''Member In''', is a dyadicprimitive function which tests if each of the elements of the left [[argument]..."
(Created page with "{{Built-in|Membership|∊}}, also called '''Member Of''' or '''Member In''', is a dyadicprimitive function which tests if each of the elements of the left [[argument]...")