Were M2 and M3 directed by a film editor that M1 was written by and executive produced by
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.writer.film M1 .
M2 ns:film.film.directed_by ?x0 .
M3 ns:film.film.directed_by ?x0
}