Was a film producer employed by M2 , employed by M3 , and employed by M4 M0
SELECT count(*) WHERE {
M0 a ns:film.producer .
M0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
M0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
M0 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}