What screenwriter was a German art director that produced M3 and M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_art_director .
?x0 a ns:film.writer .
?x0 ns:film.producer.film|ns:film.production_company.films M3 .
?x0 ns:film.producer.film|ns:film.production_company.films M4 .
?x0 ns:people.person.nationality ns:m.0345h
}