@NotNull
  private static IntToIntMap createEmptyIntToIntMap(@NotNull final Flags visibleIndexes) {
    return new IntToIntMap() {
      @Override
      public int shortSize() {
        return 0;
      }

      @Override
      public int longSize() {
        return visibleIndexes.size();
      }

      @Override
      public int getLongIndex(int shortIndex) {
        return 0;
      }

      @Override
      public int getShortIndex(int longIndex) {
        return 0;
      }
    };
  }
@NotNull
  private static IntToIntMap createEmptyIntToIntMap(@NotNull final Flags visibleIndexes)