Which film director that M3 and M4 starred was a Canadian art director
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.director .
?x0 a ns:film.film_art_director .
?x0 ns:film.actor.film/ns:film.performance.film M3 .
?x0 ns:film.actor.film/ns:film.performance.film M4 .
?x0 ns:people.person.nationality ns:m.0d060g
}