question: Did M1 and M2 produce and distribute a film 's sequel
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.prequel ?x1 .
  ?x1 a ns:film.film .
  M1 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film ?x0 .
  M1 ns:film.producer.film|ns:film.production_company.films ?x0 .
  M2 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film ?x0 .
  M2 ns:film.producer.film|ns:film.production_company.films ?x0
  }