question: Was a German writer of M0 , M1 , M2 , M3 , and M4 a art director of M6
query: SELECT count(*) WHERE {
  ?x0 ns:film.film_art_director.films_art_directed M6 .
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:film.writer.film M1 .
  ?x0 ns:film.writer.film M2 .
  ?x0 ns:film.writer.film M3 .
  ?x0 ns:film.writer.film M4 .
  ?x0 ns:people.person.nationality ns:m.0345h
  }