Did M1 executive produce M2 and M3 and write M0 's prequel 's prequel
SELECT count(*) WHERE {
?x0 ns:film.film.sequel ?x1 .
?x1 ns:film.film.sequel M0 .
M1 ns:film.producer.films_executive_produced M2 .
M1 ns:film.producer.films_executive_produced M3 .
M1 ns:film.writer.film ?x0
}