question: Was a prequel of M0 directed and written by a art director
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.directed_by ?x1 .
  ?x0 ns:film.film.sequel M0 .
  ?x0 ns:film.film.written_by ?x1 .
  ?x1 a ns:film.film_art_director
  }