Were M2 , M5 , and M6 written by a film editor , edited by M1 's star , and written by M3 and M4
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x1 ns:film.actor.film/ns:film.performance.film M1 .
M2 ns:film.film.edited_by ?x1 .
M2 ns:film.film.written_by ?x0 .
M2 ns:film.film.written_by M3 .
M2 ns:film.film.written_by M4 .
M5 ns:film.film.edited_by ?x1 .
M5 ns:film.film.written_by ?x0 .
M5 ns:film.film.written_by M3 .
M5 ns:film.film.written_by M4 .
M6 ns:film.film.edited_by ?x1 .
M6 ns:film.film.written_by ?x0 .
M6 ns:film.film.written_by M3 .
M6 ns:film.film.written_by M4
}