question: Was a film producer a German art director that M3 was produced by
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 a ns:film.producer .
  ?x0 ns:film.producer.film|ns:film.production_company.films M3 .
  ?x0 ns:people.person.nationality ns:m.0345h
  }