persistable sclass G22PixelSplitMasks<A> is IG22MasksHolder<MultiSet<A>> {
  replace Mask with IG22Mask<MultiSet<A>>.
  
  Pt splitPixel;
  gettable IG22MasksHolder<MultiSet<A>> darkHolder;
  gettable IG22MasksHolder<MultiSet<A>> brightHolder;
  
  public L<Mask> masks() {
    ret new ConcatOnDemandList(
      darkHolder.masks(),
      brightHolder.masks());
  }
  
  !include early #1035854 // Masks holder Include
}