question: What German art director of M6 was employed by M0 , employed by M1 and M2 , and employed by M3 and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film_art_director.films_art_directed M6 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
  ?x0 ns:people.person.nationality ns:m.0345h
  }