Was a art director employed by M2 and M3 a costume designer
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 a ns:film.film_costumer_designer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}