srecord noeq G22MaskUtils(G22Utils g22utils) {
  <A> IG22SimpleMasksHolder<MultiSet<A>> simpleMaskSet() {
    ret new G22HashedMasks;
  }
  
  <A> IG22OptimizedMasksHolder<MultiSet<A>> optimizedMaskSet(IG22MasksHolder masks) {
    var search = new G22CriticalPixelSearch(masks);
    ret search.bestTree();
  }
}