What was directed by M0 , M1 , M2 , and M3 and produced by a Canadian film director
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.directed_by M0 .
?x0 ns:film.film.directed_by M1 .
?x0 ns:film.film.directed_by M2 .
?x0 ns:film.film.directed_by M3 .
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x1 a ns:film.director .
?x1 ns:people.person.nationality ns:m.0d060g
}