}
  }

  private static class TransformedEntriesSortedMap<
          K extends @Nullable Object, V1 extends @Nullable Object, V2 extends @Nullable Object>
      extends TransformedEntriesMap<K, V1, V2> implements SortedMap<K, V2> {

    protected SortedMap<K, V1> fromMap() {
      return (SortedMap<K, V1>) fromMap;
    }

    TransformedEntriesSortedMap(