Were M2 and M4 edited by M3 , directed by a film editor , and directed by M0 's writer
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x1 a ns:film.editor .
M2 ns:film.film.directed_by ?x0 .
M2 ns:film.film.directed_by ?x1 .
M2 ns:film.film.edited_by M3 .
M4 ns:film.film.directed_by ?x0 .
M4 ns:film.film.directed_by ?x1 .
M4 ns:film.film.edited_by M3
}