Were M2 and M3 directed by a film director that directed M1 and produced M0
SELECT count(*) WHERE {
?x0 ns:film.director.film M1 .
?x0 ns:film.producer.film|ns:film.production_company.films M0 .
M2 ns:film.film.directed_by ?x0 .
M3 ns:film.film.directed_by ?x0
}