Did M1 and M4 employ a film director and employ M2 and M3
SELECT count(*) WHERE {
?x0 a ns:film.director .
M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
M1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person M3
}