Were M2 and M4 executive produced by a screenwriter , executive produced by a art director , and executive produced by M3
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x1 a ns:film.writer .
M2 ns:film.film.executive_produced_by ?x0 .
M2 ns:film.film.executive_produced_by ?x1 .
M2 ns:film.film.executive_produced_by M3 .
M4 ns:film.film.executive_produced_by ?x0 .
M4 ns:film.film.executive_produced_by ?x1 .
M4 ns:film.film.executive_produced_by M3
}