Was M1 employed by M2 , employed by M3 and M4 , employed by M0 's producer , and employed by M5
SELECT count(*) WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films M0 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company M5
}