Did M3 employ a art director influenced by M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:influence.influence_node.influenced_by M1 .
?x0 ns:influence.influence_node.influenced_by M2 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}