Did a actor write M1 and M2 and produce a film 's prequel and sequel
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2 .
?x1 ns:film.film.prequel ?x2 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film
}