Did M1 , M2 , M3 , and M4 executive produce M0 's prequel
SELECT count(*) WHERE {
?x0 ns:film.film.sequel M0 .
M1 ns:film.producer.films_executive_produced ?x0 .
M2 ns:film.producer.films_executive_produced ?x0 .
M3 ns:film.producer.films_executive_produced ?x0 .
M4 ns:film.producer.films_executive_produced ?x0
}