sclass AbstractFastRegions_ShuffledScan is Steppable {
  AbstractFastRegions regionMaker;
  WeightlessShuffledIterator iterator;
  
  *(AbstractFastRegions *regionMaker) {
    regionMaker.init();
    iterator = new(regionMaker.size);
  }
  
  public bool step() {
    if (!iterator.hasNext())
      false;
    regionMaker.runner = iterator.nextIndex();
    if (regionMaker.regionMatrix[runner] == 0)
      regionMaker.makeRegion();
    true;
  }
}