Was a prequel of a film directed by , written by , and executive produced by M1 's editor
SELECT count(*) WHERE {
?x0 ns:film.film.directed_by ?x1 .
?x0 ns:film.film.executive_produced_by ?x1 .
?x0 ns:film.film.sequel ?x2 .
?x0 ns:film.film.written_by ?x1 .
?x1 ns:film.editor.film M1 .
?x2 a ns:film.film
}