Did M2 and M3 influence a person and influence a costume designer
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x1 a ns:film.film_costumer_designer .
M2 ns:influence.influence_node.influenced ?x0 .
M2 ns:influence.influence_node.influenced ?x1 .
M3 ns:influence.influence_node.influenced ?x0 .
M3 ns:influence.influence_node.influenced ?x1
}