question: Was a film whose prequel was directed by M5 and starred M0 , M1 , M2 , M3 , and M4 M6
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.directed_by M5 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M0 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M1 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M2 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M3 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M4 .
  M6 a ns:film.film .
  M6 ns:film.film.prequel ?x0
  }