question: Was M1 distributed by M2 and distributed by a film distributor
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_distributor .
  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
  }