Was a cinematographer and director of M1 , M2 , and M3 employed by M0
SELECT count(*) WHERE {
?x0 ns:film.cinematographer.film M1 .
?x0 ns:film.cinematographer.film M2 .
?x0 ns:film.cinematographer.film M3 .
?x0 ns:film.director.film M1 .
?x0 ns:film.director.film M2 .
?x0 ns:film.director.film M3 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0
}