question: Were M1 and M2 directed by M0 's sequel 's producer and writer
query: SELECT count(*) WHERE {
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:film.writer.film ?x1 .
  ?x1 ns:film.film.prequel M0 .
  M1 ns:film.film.directed_by ?x0 .
  M2 ns:film.film.directed_by ?x0
  }