question: Was M0 's male writer a person 's actor
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character ?x1 .
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:people.person.gender ns:m.05zppz .
  ?x1 a ns:people.person
  }