question: Was M2 written by a art director of a film , directed by M3 and M4 , and edited by a film editor
query: SELECT count(*) WHERE {
  ?x0 ns:film.film_art_director.films_art_directed ?x1 .
  ?x1 a ns:film.film .
  ?x2 a ns:film.editor .
  M2 ns:film.film.directed_by M3 .
  M2 ns:film.film.directed_by M4 .
  M2 ns:film.film.edited_by ?x2 .
  M2 ns:film.film.written_by ?x0
  }