def all_in(items, collection):
return all(are_in(items, collection))<EOL>
Return True if all of the items are in the collection

    :param items: items that may be in the collection
    :param collection: a collection
    :returns: a boolean

    >>> all_in(2, [1, 3, 2])
    True
    >>> all_in([1, 2], [1, 3, 2])
    True
    >>> all_in([1, 2], [1, 3])
    False