question: Was M2 's prequel 's male star a person
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
  ?x0 ns:people.person.gender ns:m.05zppz .
  ?x1 ns:film.film.sequel M2
  }