Did a art director edit M1 , write M3 , edit M2 , and edit M4 's prequel
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:film.editor.film ?x1 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.writer.film M3 .
?x1 ns:film.film.sequel M4
}