question: Were M2 , M3 , and M4 directed by a Chinese editor of a sequel of M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film ?x1 .
  ?x0 ns:people.person.nationality ns:m.0d05w3 .
  ?x1 ns:film.film.prequel M1 .
  M2 ns:film.film.directed_by ?x0 .
  M3 ns:film.film.directed_by ?x0 .
  M4 ns:film.film.directed_by ?x0
  }