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