question: Was a German cinematographer that M3 starred a film producer
query: SELECT count(*) WHERE {
  ?x0 a ns:film.cinematographer .
  ?x0 a ns:film.producer .
  ?x0 ns:film.actor.film/ns:film.performance.film M3 .
  ?x0 ns:people.person.nationality ns:m.0345h
  }