question: Did M1 , M5 , and M6 executive produce M2 and M3 , executive produce M4 , and executive produce M0 's sequel
query: SELECT count(*) WHERE {
  ?x0 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 .
  M1 ns:film.producer.films_executive_produced M4 .
  M5 ns:film.producer.films_executive_produced ?x0 .
  M5 ns:film.producer.films_executive_produced M2 .
  M5 ns:film.producer.films_executive_produced M3 .
  M5 ns:film.producer.films_executive_produced M4 .
  M6 ns:film.producer.films_executive_produced ?x0 .
  M6 ns:film.producer.films_executive_produced M2 .
  M6 ns:film.producer.films_executive_produced M3 .
  M6 ns:film.producer.films_executive_produced M4
  }