question: Did a writer and director of M0 produce a film 's prequel and sequel
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M0 .
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:film.writer.film M0 .
  ?x1 ns:film.film.prequel ?x2 .
  ?x1 ns:film.film.sequel ?x2 .
  ?x2 a ns:film.film
  }