Which art director that M2 and M3 were played by was employed by M1
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:film.actor.film/ns:film.performance.character M2 .
?x0 ns:film.actor.film/ns:film.performance.character M3 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1
}