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