question: Was a film 's prequel edited by M0 and executive produced by a film director
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.edited_by M0 .
  ?x0 ns:film.film.executive_produced_by ?x1 .
  ?x0 ns:film.film.sequel ?x2 .
  ?x1 a ns:film.director .
  ?x2 a ns:film.film
  }