Who was influenced by a Canadian director of M2 , M3 , and M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:influence.influence_node.influenced_by ?x1 .
?x1 ns:film.director.film M2 .
?x1 ns:film.director.film M3 .
?x1 ns:film.director.film M4 .
?x1 ns:people.person.nationality ns:m.0d060g
}