question: Did M1 , M3 , M4 , and M5 write M2 and write a sequel of a film
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.prequel ?x1 .
  ?x1 a ns:film.film .
  M1 ns:film.writer.film ?x0 .
  M1 ns:film.writer.film M2 .
  M3 ns:film.writer.film ?x0 .
  M3 ns:film.writer.film M2 .
  M4 ns:film.writer.film ?x0 .
  M4 ns:film.writer.film M2 .
  M5 ns:film.writer.film ?x0 .
  M5 ns:film.writer.film M2
  }