Did M2 and M4 influence M3 and influence a Canadian film editor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:people.person.nationality ns:m.0d060g .
M2 ns:influence.influence_node.influenced ?x0 .
M2 ns:influence.influence_node.influenced M3 .
M4 ns:influence.influence_node.influenced ?x0 .
M4 ns:influence.influence_node.influenced M3
}