Were M1 , M2 , and M3 distributed by M0 's writer
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
M1 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor ?x0 .
M2 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor ?x0 .
M3 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor ?x0
}