// similarity = e.g. 0.99f
static Rect rgbFindMostSimilarClip_multi(RGBImage big, L<RGBImage> patterns, L<Rect> clips, float similarity) {
  Rect found = null;
  int w = big.getWidth(), h = big.getHeight();
  for (RGBImage pat : patterns)
    for (Rect r : clips) {
      float sim = rgbImageSimilarityResized(big.clip(r), pat, similarity);
      if (sim >= similarity) {
        found = r;
        similarity = sim;
      }
    }
  ret found;
}