Did a film 's producer employ M0 , M1 , and M2 and employ M3 's writer
SELECT count(*) WHERE {
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:film.producer.film|ns:film.production_company.films ?x2 .
?x1 ns:film.writer.film M3 .
?x2 a ns:film.film
}