question: Were M1 and M3 executive produced by M0 's sequel 's executive producer and writer and executive produced by M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x0 ns:film.writer.film ?x1 .
  ?x1 ns:film.film.prequel M0 .
  M1 ns:film.film.executive_produced_by ?x0 .
  M1 ns:film.film.executive_produced_by M2 .
  M3 ns:film.film.executive_produced_by ?x0 .
  M3 ns:film.film.executive_produced_by M2
  }