*/
    return new UnmodifiableRowSortedMap<>(table);
  }

  private static final class UnmodifiableRowSortedMap<
          R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
      extends UnmodifiableTable<R, C, V> implements RowSortedTable<R, C, V> {

    public UnmodifiableRowSortedMap(RowSortedTable<R, ? extends C, ? extends V> delegate) {