Did M1 employ M2 , employ M3 , employ M0 's producer , and employ M4
SELECT count(*) WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films M0 .
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 .
M1 ns:business.employer.employees/ns:business.employment_tenure.person M4
}