question: Did a film 's sequel star M0 , M1 , M2 , and M3
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.prequel ?x1 .
  ?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 .
  ?x1 a ns:film.film
  }