Did M2 star a producer of M1 , star M3 , star M4 , and star M0 's editor
SELECT count(*) WHERE {
?x0 ns:film.editor.film M0 .
?x1 ns:film.producer.film|ns:film.production_company.films M1 .
M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
M2 ns:film.film.starring/ns:film.performance.actor ?x1 .
M2 ns:film.film.starring/ns:film.performance.actor M3 .
M2 ns:film.film.starring/ns:film.performance.actor M4
}