Did a film star a art director and star M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.starring/ns:film.performance.actor ?x1 .
?x0 ns:film.film.starring/ns:film.performance.actor M1 .
?x0 ns:film.film.starring/ns:film.performance.actor M2 .
?x1 a ns:film.film_art_director
}