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