question: Was a film producer a art director of M1 , M2 , M3 , M4 , and M5
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  ?x0 ns:film.film_art_director.films_art_directed M1 .
  ?x0 ns:film.film_art_director.films_art_directed M2 .
  ?x0 ns:film.film_art_director.films_art_directed M3 .
  ?x0 ns:film.film_art_director.films_art_directed M4 .
  ?x0 ns:film.film_art_director.films_art_directed M5
  }