Was a film producer employed by M0 and M1 and employed by M2 and M3 M4 's producer
SELECT count(*) WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films M4 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}