Was a person that M2 and M3 were written by and starred a art director
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
?x0 ns:film.actor.film/ns:film.performance.film M3 .
?x0 ns:film.writer.film M2 .
?x0 ns:film.writer.film M3
}