What did a art director employed by M1 , M2 , and M3 found
SELECT DISTINCT ?x0 WHERE {
?x0 ns:organization.organization.founders ?x1 .
?x1 a ns:film.film_art_director .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}