question: Were M2 , M3 , and M4 produced by a German film editor
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:people.person.nationality ns:m.0345h .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M3 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M4 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }