Who distributed M1 and M2
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M1 .
?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M2
}