static Rect ocr_stepToTheRight(Rect r, L<Rect> rects) {
  if (r == null) null;
  new Lowest<Rect> best;
  for (Rect r2 : rects) {
    if (r2.x < r.x2()) continue;
    if (!rectsOverlapY(r, r2)) continue;
    best.put(r2, r2.x);
  }
  ret best.get();
}