Was M2 edited by a art director that M1 was edited by and starred
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.editor.film M1 .
M2 ns:film.film.edited_by ?x0
}