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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def filter(self, query: Query, entity: type) -> Tuple[Query, Any]: """Define the filter function that every node must to implement. :param query: The sqlalchemy query. :type query: Query :param entity: The entity model. :type entity: type :return: The filtered query. :rtype: Tuple[Query, Any] """

        raise NotImplementedError('You must implement this.')