Who distributed a film that M2 , M3 , and M4 directed
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film ?x1 .
?x1 a ns:film.film .
?x1 ns:film.film.directed_by M2 .
?x1 ns:film.film.directed_by M3 .
?x1 ns:film.film.directed_by M4
}