Was a sequel of a film directed and produced by M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.film.directed_by M0 .
?x0 ns:film.film.directed_by M1 .
?x0 ns:film.film.prequel ?x1 .
?x0 ns:film.film.produced_by|ns:film.film.production_companies M0 .
?x0 ns:film.film.produced_by|ns:film.film.production_companies M1 .
?x1 a ns:film.film
}