Did M4 star a film editor that executive produced M1 , M2 , and M3
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.producer.films_executive_produced M2 .
?x0 ns:film.producer.films_executive_produced M3 .
M4 ns:film.film.starring/ns:film.performance.actor ?x0
}