Was M0 's sequel edited by and written by M1 's star and editor
SELECT count(*) WHERE {
?x0 ns:film.film.edited_by ?x1 .
?x0 ns:film.film.prequel M0 .
?x0 ns:film.film.written_by ?x1 .
?x1 ns:film.actor.film/ns:film.performance.film M1 .
?x1 ns:film.editor.film M1
}