Were M1 and M4 written by a director of a film 's prequel , edited by M2 , and directed by M3
SELECT count(*) WHERE {
?x0 ns:film.director.film ?x1 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film .
M1 ns:film.film.directed_by M3 .
M1 ns:film.film.edited_by M2 .
M1 ns:film.film.written_by ?x0 .
M4 ns:film.film.directed_by M3 .
M4 ns:film.film.edited_by M2 .
M4 ns:film.film.written_by ?x0
}