What film written by M1 did M2 , M3 , and M4 distribute
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M2 .
?x0 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M3 .
?x0 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M4 .
?x0 ns:film.film.written_by M1
}