Did M1 executive produce M2 , executive produce M3 , and produce a prequel of M0
SELECT count(*) WHERE {
?x0 ns:film.film.sequel M0 .
M1 ns:film.producer.films_executive_produced M2 .
M1 ns:film.producer.films_executive_produced M3 .
M1 ns:film.producer.film|ns:film.production_company.films ?x0
}