question: Was M1 a film producer that a sequel of M0 starred and M3 starred
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.prequel M0 .
  M1 a ns:film.producer .
  M1 ns:film.actor.film/ns:film.performance.film ?x0 .
  M1 ns:film.actor.film/ns:film.performance.film M3
  }