Did M2 and M3 star a male editor of M1
SELECT count(*) WHERE {
?x0 ns:film.editor.film M1 .
?x0 ns:people.person.gender ns:m.05zppz .
M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
M3 ns:film.film.starring/ns:film.performance.actor ?x0
}