question: Were M1 and M4 distributed by M2 and M3 and distributed by a film producer
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  M1 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor ?x0 .
  M1 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M2 .
  M1 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M3 .
  M4 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor ?x0 .
  M4 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M2 .
  M4 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor M3
  }