Did M2 star a film editor and star M1 's art director 's actor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x1 ns:film.actor.film/ns:film.performance.character ?x2 .
?x2 ns:film.film_art_director.films_art_directed M1 .
M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
M2 ns:film.film.starring/ns:film.performance.actor ?x1
}