Did M1 and M2 produce and distribute a film 's sequel
SELECT count(*) WHERE {
?x0 ns:film.film.prequel ?x1 .
?x1 a ns:film.film .
M1 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film ?x0 .
M1 ns:film.producer.film|ns:film.production_company.films ?x0 .
M2 ns:film.film_distributor.films_distributed/ns:film.film_film_distributor_relationship.film ?x0 .
M2 ns:film.producer.film|ns:film.production_company.films ?x0
}