question: Were M1 and M4 written by M2 and M3 and directed by a executive producer of M0 's prequel
query: SELECT count(*) WHERE {
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x1 ns:film.film.sequel M0 .
  M1 ns:film.film.directed_by ?x0 .
  M1 ns:film.film.written_by M2 .
  M1 ns:film.film.written_by M3 .
  M4 ns:film.film.directed_by ?x0 .
  M4 ns:film.film.written_by M2 .
  M4 ns:film.film.written_by M3
  }