Did a director and star of M2 's prequel edit M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
?x0 ns:film.director.film ?x1 .
?x0 ns:film.editor.film M0 .
?x0 ns:film.editor.film M1 .
?x1 ns:film.film.sequel M2
}