Were M1 and M2 edited by and directed by a film producer
SELECT count(*) WHERE {
?x0 a ns:film.producer .
M1 ns:film.film.directed_by ?x0 .
M1 ns:film.film.edited_by ?x0 .
M2 ns:film.film.directed_by ?x0 .
M2 ns:film.film.edited_by ?x0
}