Was a star and producer of a film a writer of M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x0 ns:film.writer.film M0 .
?x0 ns:film.writer.film M1 .
?x1 a ns:film.film
}