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