* set. The order in which these subsets appear in the outer set is undefined. Note that the power
   * set of the empty set is not the empty set, but a one-element set containing the empty set.
   *
   * <p>The returned set and its constituent sets use {@code equals} to decide whether two elements
   * are identical, even if the input set uses a different concept of equivalence.
   *

    Set<String> set = of("a", "b");
    assertEquals(newHashSet("a", "b"), set);
  }

  public void testCreation_threeElements() {
    Set<String> set = of("a", "b", "c");
    assertEquals(newHashSet("a", "b", "c"), set);
  }

  public void testCreation_fourElements() {
    Set<String> set = of("a", "b", "c", "d");
    assertEquals(newHashSet("a", "b", "c", "d"), set);
  }

  public void testCreation_fiveElements() {

    cache.close()
    createNewCacheWithSize(10)
    set("a", "a", "a")
    set("b", "b", "b")
    set("c", "c", "c")
    set("d", "d", "d")
    set("e", "e", "e")
    cache["b"]!!.close() // 'B' is now least recently used.

    // Causing the size to grow to 12 should evict 'A'.
    set("f", "f", "f")
    // Causing the size to grow to 12 should evict 'C'.
    set("g", "g", "g")
    cache.flush()

    for (int i = 0; i < inputSize; i++) {
      builder.add(i % setSize);
    }
    ImmutableSet<Integer> set = builder.build();
    assertTrue(set instanceof RegularImmutableSet);
    assertEquals(
        "Input size " + inputSize + " and set size " + setSize,
        tableSize,
        ((RegularImmutableSet<Integer>) set).table.length);
  }

  public void testCopyOf_copiesImmutableSortedSet() {

    for (int i = 0; i < inputSize; i++) {
      builder.add(i % setSize);
    }
    ImmutableSet<Integer> set = builder.build();
    assertTrue(set instanceof RegularImmutableSet);
    assertEquals(
        "Input size " + inputSize + " and set size " + setSize,
        tableSize,
        ((RegularImmutableSet<Integer>) set).table.length);
  }

  public void testCopyOf_copiesImmutableSortedSet() {

   */
  private Iterable<List<Object>> buildCartesianProduct(Set<?>... sets) {
    List<Set<Optional<?>>> optionalSets = Lists.newArrayListWithExpectedSize(sets.length);
    for (Set<?> set : sets) {
      Set<Optional<?>> optionalSet =
          Sets.newLinkedHashSet(Iterables.transform(set, Optional::fromNullable));
      optionalSets.add(optionalSet);
    }
    Set<List<Optional<?>>> cartesianProduct = Sets.cartesianProduct(optionalSets);

  /**
   * Returns a {@link Set} whose methods throw {@link IllegalStateException} when the given node is
   * not present in this network.
   *
   * @since 33.1.0
   */
  protected final <T> Set<T> nodeInvalidatableSet(Set<T> set, N node) {
    return InvalidatableSet.of(
        set, () -> nodes().contains(node), () -> String.format(NODE_REMOVED_FROM_GRAPH, node));
  }

  /**

  }

  public void testLast_iterable() {
    Set<String> set = ImmutableSet.of("a", "b", "c");
    assertThat(FluentIterable.from(set).last()).hasValue("c");
  }

  public void testLast_emptyIterable() {
    Set<String> set = new HashSet<>();
    assertThat(FluentIterable.from(set).last()).isAbsent();
  }

  public void testSkip_simple() {
    Collection<String> set = ImmutableSet.of("a", "b", "c", "d", "e");

                    return encoder_instance(obj)
    if include is not None and not isinstance(include, (set, dict)):
        include = set(include)  # type: ignore[assignment]  # ty: ignore[unused-ignore-comment]
    if exclude is not None and not isinstance(exclude, (set, dict)):
        exclude = set(exclude)  # type: ignore[assignment]  # ty: ignore[unused-ignore-comment]
    if isinstance(obj, BaseModel):

      Set<Feature<?>> multimapFeatures) {
    Set<Feature<?>> derivedFeatures = copyToSet(multimapFeatures);
    derivedFeatures.remove(CollectionFeature.SERIALIZABLE);
    derivedFeatures.remove(CollectionFeature.SERIALIZABLE_INCLUDING_VIEWS);
    return derivedFeatures;
  }

  private static Set<Feature<?>> computeAsMapFeatures(Set<Feature<?>> multimapFeatures) {
    Set<Feature<?>> derivedFeatures = copyToSet(multimapFeatures);