question: Was M2 executive produced by a art director that M1 was executive produced and directed by
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.producer.films_executive_produced M1 .
  M2 ns:film.film.executive_produced_by ?x0
  }