question: Did M1 and M4 executive produce M2 and M3 and executive produce a sequel of M0 's sequel
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.prequel ?x1 .
  ?x1 ns:film.film.prequel M0 .
  M1 ns:film.producer.films_executive_produced ?x0 .
  M1 ns:film.producer.films_executive_produced M2 .
  M1 ns:film.producer.films_executive_produced M3 .
  M4 ns:film.producer.films_executive_produced ?x0 .
  M4 ns:film.producer.films_executive_produced M2 .
  M4 ns:film.producer.films_executive_produced M3
  }