Did M3 and M4 influence a film editor that M1 and M2 were directed by
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.director.film M1 .
?x0 ns:film.director.film M2 .
M3 ns:influence.influence_node.influenced ?x0 .
M4 ns:influence.influence_node.influenced ?x0
}