question: Which prequel of M0 did M1 and M2 distribute
query: SELECT DISTINCT ?x0 WHERE {
  ?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 .
  ?x0 ns:film.film.sequel M0
  }