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