question: Who was a German Canadian cinematographer of M3 and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.cinematographer.film M3 .
  ?x0 ns:film.cinematographer.film M4 .
  ?x0 ns:people.person.nationality ns:m.0345h .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }