Did a film distributor employ a art director of M1 , M2 , and M3
SELECT count(*) WHERE {
?x0 a ns:film.film_distributor .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x1 ns:film.film_art_director.films_art_directed M1 .
?x1 ns:film.film_art_director.films_art_directed M2 .
?x1 ns:film.film_art_director.films_art_directed M3
}