Did a screenwriter executive produce a prequel of M3 and write M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2 .
?x1 ns:film.film.sequel M3
}