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