question: What German cinematographer of M1 and M2 was M3 's director
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.cinematographer.film M1 .
  ?x0 ns:film.cinematographer.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:people.person.nationality ns:m.0345h
  }