Did M3 employ a film director , employ M1 's director , and employ M2 's star
SELECT count(*) WHERE {
?x0 a ns:film.director .
?x1 ns:film.director.film M1 .
?x2 ns:film.actor.film/ns:film.performance.film M2 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x2
}