question: Was a film written by M1 , directed by M2 and M3 , and written by a art director and director of M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  ?x0 ns:film.film.directed_by M2 .
  ?x0 ns:film.film.directed_by M3 .
  ?x0 ns:film.film.written_by ?x1 .
  ?x0 ns:film.film.written_by M1 .
  ?x1 ns:film.director.film M4 .
  ?x1 ns:film.film_art_director.films_art_directed M4
  }