return unmodifiableRowSortedTable(original);
  }

  @Override
  protected SortedMap<String, Map<Integer, Character>> makePopulatedMap() {
    RowSortedTable<String, Integer, Character> table = TreeBasedTable.create();
    table.put("foo", 1, 'a');
    table.put("bar", 1, 'b');
    table.put("foo", 3, 'c');
    return unmodifiableRowSortedTable(table).rowMap();
  }

    return unmodifiableRowSortedTable(original);
  }

  @Override
  protected Map<String, Map<Integer, Character>> makePopulatedMap() {
    RowSortedTable<Integer, String, Character> table = TreeBasedTable.create();
    table.put(1, "foo", 'a');
    table.put(1, "bar", 'b');
    table.put(3, "foo", 'c');
    return unmodifiableRowSortedTable(table).columnMap();
  }

    return unmodifiableRowSortedTable(table);
  }

  @Override
  protected Map<String, Integer> makePopulatedMap() {
    RowSortedTable<Character, String, Integer> table = TreeBasedTable.create();
    table.put('a', "one", 1);
    table.put('a', "two", 2);
    table.put('a', "three", 3);
    table.put('b', "four", 4);
    return unmodifiableRowSortedTable(table).row('a');
  }

    return unmodifiableRowSortedTable(table);
  }

  @Override
  protected Map<String, Integer> makePopulatedMap() {
    RowSortedTable<Character, String, Integer> table = TreeBasedTable.create();
    table.put('a', "one", 1);
    table.put('a', "two", 2);
    table.put('a', "three", 3);
    table.put('b', "four", 4);
    return unmodifiableRowSortedTable(table).row('a');
  }

    return unmodifiableRowSortedTable(original);
  }

  @Override
  protected SortedMap<String, Map<Integer, Character>> makePopulatedMap() {
    RowSortedTable<String, Integer, Character> table = TreeBasedTable.create();
    table.put("foo", 1, 'a');
    table.put("bar", 1, 'b');
    table.put("foo", 3, 'c');
    return unmodifiableRowSortedTable(table).rowMap();
  }

                    return unmodifiableRowSortedTable(table).rowKeySet();
                  }

                  @Override
                  public List<String> order(List<String> insertionOrder) {
                    sort(insertionOrder);
                    return insertionOrder;
                  }
                })
            .named("unmodifiableRowSortedTable[TreeBasedTable].rowKeySet")

                    return unmodifiableRowSortedTable(table).rowKeySet();
                  }

                  @Override
                  public List<String> order(List<String> insertionOrder) {
                    sort(insertionOrder);
                    return insertionOrder;
                  }
                })
            .named("unmodifiableRowSortedTable[TreeBasedTable].rowKeySet")

          .put(ImmutableBiMap.class, ImmutableBiMap.of())
          .put(Table.class, ImmutableTable.of())
          .put(ImmutableTable.class, ImmutableTable.of())
          .put(RowSortedTable.class, Tables.unmodifiableRowSortedTable(TreeBasedTable.create()))
          .put(ClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())
          .put(ImmutableClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())

          .put(ImmutableBiMap.class, ImmutableBiMap.of())
          .put(Table.class, ImmutableTable.of())
          .put(ImmutableTable.class, ImmutableTable.of())
          .put(RowSortedTable.class, Tables.unmodifiableRowSortedTable(TreeBasedTable.create()))
          .put(ClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())
          .put(ImmutableClassToInstanceMap.class, ImmutableClassToInstanceMap.builder().build())

   * @return an unmodifiable view of the specified table
   * @since 11.0
   */
  public static <R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
      RowSortedTable<R, C, V> unmodifiableRowSortedTable(
          RowSortedTable<R, ? extends C, ? extends V> table) {
    /*
     * It's not ? extends R, because it's technically not covariant in R. Specifically,