question: Was M3 directed and written by a Chinese director of M1 and M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:people.person.nationality ns:m.0d05w3 .
  M3 ns:film.film.directed_by ?x0 .
  M3 ns:film.film.written_by ?x0
  }