question: Did M2 write a film whose distributor distributed M1
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  ?x0 ns:film.film.distributors/ns:film.film_film_distributor_relationship.distributor ?x1 .
  ?x1 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M1 .
  M2 ns:film.writer.film ?x0
  }