Was M1 a film producer employed by a film distributor and employed by M3 and M4
SELECT count(*) WHERE {
?x0 a ns:film.film_distributor .
M1 a ns:film.producer .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}