question: Was a film 's art director and editor a director of M0
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M0 .
  ?x0 ns:film.editor.film ?x1 .
  ?x0 ns:film.film_art_director.films_art_directed ?x1 .
  ?x1 a ns:film.film
  }