What German screenwriter that M3 and M4 were directed by was M2 's art director
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.writer .
?x0 ns:film.director.film M3 .
?x0 ns:film.director.film M4 .
?x0 ns:film.film_art_director.films_art_directed M2 .
?x0 ns:people.person.nationality ns:m.0345h
}