Was M2 employed by M3 , employed by M1 's distributor , and employed by a film producer
SELECT count(*) WHERE {
?x0 a ns:film.producer .
?x1 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M1 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}