What film did M1 and M2 write and a art director produce
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.written_by M1 .
?x0 ns:film.film.written_by M2 .
?x1 a ns:film.film_art_director
}