Did M2 and M3 employ a costume designer that M1 influenced
SELECT count(*) WHERE {
?x0 a ns:film.film_costumer_designer .
?x0 ns:influence.influence_node.influenced_by M1 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}