Was M2 directed by M3 , directed by M1 's editor , and directed by a art director
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x1 ns:film.editor.film M1 .
M2 ns:film.film.directed_by ?x0 .
M2 ns:film.film.directed_by ?x1 .
M2 ns:film.film.directed_by M3
}