Did a art director that M4 was played by edit M1 , M2 , and M3
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:film.actor.film/ns:film.performance.character M4 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.editor.film M3
}