question: Which Chinese art director directed M2 and M3 and directed M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.director.film M4 .
  ?x0 ns:people.person.nationality ns:m.0d05w3
  }