Did M2 star M1 's actor , star M3 , star M4 , and star a producer of M0
SELECT count(*) WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films M0 .
?x1 ns:film.actor.film/ns:film.performance.character M1 .
M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
M2 ns:film.film.starring/ns:film.performance.actor ?x1 .
M2 ns:film.film.starring/ns:film.performance.actor M3 .
M2 ns:film.film.starring/ns:film.performance.actor M4
}