Did a screenwriter executive produce M4 's prequel and edit M1 , M2 , and M3
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.editor.film M3 .
?x0 ns:film.producer.films_executive_produced ?x1 .
?x1 ns:film.film.sequel M4
}