question: What did a art director direct and M0 and M1 direct
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.directed_by ?x1 .
  ?x0 ns:film.film.directed_by M0 .
  ?x0 ns:film.film.directed_by M1 .
  ?x1 a ns:film.film_art_director
  }