question: Was M0 's producer a art director of M1 and M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.film_art_director.films_art_directed M1 .
  ?x0 ns:film.film_art_director.films_art_directed M2 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M0
  }