What was written by M0 and M1 , written by a person , and written by a art director
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.written_by ?x1 .
?x0 ns:film.film.written_by ?x2 .
?x0 ns:film.film.written_by M0 .
?x0 ns:film.film.written_by M1 .
?x1 a ns:film.film_art_director .
?x2 a ns:people.person
}