Did a cinematographer that edited M1 and M2 and directed M4 's sequel edit M3
SELECT count(*) WHERE {
?x0 a ns:film.cinematographer .
?x0 ns:film.director.film ?x1 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.editor.film M3 .
?x1 ns:film.film.prequel M4
}