question: Was M3 written by a British actor and edited by M2 's director and editor
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  ?x1 ns:film.director.film M2 .
  ?x1 ns:film.editor.film M2 .
  M3 ns:film.film.edited_by ?x1 .
  M3 ns:film.film.written_by ?x0
  }