question: Was a film producer a distributor of M1 and M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  ?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M1 .
  ?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M2
  }