question: Was a cinematographer M1 's prequel 's star and director
query: SELECT count(*) WHERE {
  ?x0 a ns:film.cinematographer .
  ?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
  ?x0 ns:film.director.film ?x1 .
  ?x1 ns:film.film.sequel M1
  }