question: Was a prequel of M0 edited by a screenwriter and directed by M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.directed_by M1 .
  ?x0 ns:film.film.edited_by ?x1 .
  ?x0 ns:film.film.sequel M0 .
  ?x1 a ns:film.writer
  }