question: Was M1 's prequel 's writer , art director , cinematographer , and editor a person
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.cinematographer.film ?x1 .
  ?x0 ns:film.editor.film ?x1 .
  ?x0 ns:film.film_art_director.films_art_directed ?x1 .
  ?x0 ns:film.writer.film ?x1 .
  ?x1 ns:film.film.sequel M1
  }