Was M1 a film written by M3 and M4 and edited by a film director
SELECT count(*) WHERE {
?x0 a ns:film.director .
M1 a ns:film.film .
M1 ns:film.film.edited_by ?x0 .
M1 ns:film.film.written_by M3 .
M1 ns:film.film.written_by M4
}