question: Was M0 's prequel edited by M1 and edited by a art director
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.edited_by ?x1 .
  ?x0 ns:film.film.edited_by M1 .
  ?x0 ns:film.film.sequel M0 .
  ?x1 a ns:film.film_art_director
  }