Who was influenced by M1 , was influenced by M2 and M3 , and was influenced by M4 's Canadian writer
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:influence.influence_node.influenced_by ?x1 .
?x0 ns:influence.influence_node.influenced_by M1 .
?x0 ns:influence.influence_node.influenced_by M2 .
?x0 ns:influence.influence_node.influenced_by M3 .
?x1 ns:film.writer.film M4 .
?x1 ns:people.person.nationality ns:m.0d060g
}