question: Who was a film producer that distributed M2 and distributed M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.producer .
  ?x0 a ns:people.person .
  ?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M2 .
  ?x0 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film M3
  }