Did M1 and M4 influence M2 and M3 and influence a art director
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
M1 ns:influence.influence_node.influenced ?x0 .
M1 ns:influence.influence_node.influenced M2 .
M1 ns:influence.influence_node.influenced M3 .
M4 ns:influence.influence_node.influenced ?x0 .
M4 ns:influence.influence_node.influenced M2 .
M4 ns:influence.influence_node.influenced M3
}