Was M0 's prequel edited by M2 , directed by a person , and written by M1
SELECT count(*) WHERE {
?x0 ns:film.film.directed_by ?x1 .
?x0 ns:film.film.edited_by M2 .
?x0 ns:film.film.sequel M0 .
?x0 ns:film.film.written_by M1 .
?x1 a ns:people.person
}