Was M4 founded by a film producer that M1 , M2 , and M3 starred
SELECT count(*) WHERE {
?x0 a ns:film.producer .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
?x0 ns:film.actor.film/ns:film.performance.film M3 .
M4 ns:organization.organization.founders ?x0
}