question: Was M2 produced by a art director , edited by M3 , M4 , M5 , and M6 , and edited by a film director
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_art_director .
  ?x1 a ns:film.director .
  M2 ns:film.film.edited_by ?x1 .
  M2 ns:film.film.edited_by M3 .
  M2 ns:film.film.edited_by M4 .
  M2 ns:film.film.edited_by M5 .
  M2 ns:film.film.edited_by M6 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }