E first = elements.next();
    if (!elements.hasNext()) {
      // TODO: Remove "ImmutableSet.<E>" when eclipse bug is fixed.
      return ImmutableSet.<E>of(first);
    }

    Set<E> delegate = Sets.newLinkedHashSet();
    delegate.add(checkNotNull(first));
    do {
      delegate.add(checkNotNull(elements.next()));
    } while (elements.hasNext());

    return unsafeDelegate(delegate);
  }

     *
     * @param <E> the element type of {@link LinkedHashSet}
     * @return a new instance of {@link LinkedHashSet}
     * @see LinkedHashSet#LinkedHashSet()
     */
    public static <E> LinkedHashSet<E> newLinkedHashSet() {
        return new LinkedHashSet<>();
    }

    /**
     * Creates and returns a new instance of {@link LinkedHashSet}.
     *
     * @param <E> the element type of {@link LinkedHashSet}

    List<Set<Optional<?>>> optionalSets = Lists.newArrayListWithExpectedSize(sets.length);
    for (Set<?> set : sets) {
      Set<Optional<?>> optionalSet =
          Sets.newLinkedHashSet(Iterables.transform(set, NULLABLE_TO_OPTIONAL));
      optionalSets.add(optionalSet);
    }
    Set<List<Optional<?>>> cartesianProduct = Sets.cartesianProduct(optionalSets);
    return Iterables.transform(

    addAll(list, elements);
    return list;
  }

  public static <E extends @Nullable Object> List<E> copyToList(E[] elements) {
    return copyToList(asList(elements));
  }

  // Clone of Sets.newLinkedHashSet
  public static <E extends @Nullable Object> Set<E> copyToSet(Iterable<? extends E> elements) {
    Set<E> set = new LinkedHashSet<>();
    addAll(set, elements);
    return set;
  }

    LinkedHashSet<Integer> set = Sets.newLinkedHashSet();
    verifyLinkedHashSetContents(set, EMPTY_COLLECTION);
  }

  public void testNewLinkedHashSetFromCollection() {
    @SuppressWarnings("UseCollectionConstructor") // test of factory method
    LinkedHashSet<Integer> set = Sets.newLinkedHashSet(LONGER_LIST);
    verifyLinkedHashSetContents(set, LONGER_LIST);
  }

Map<String, Object> map = CollectionsUtil.newLinkedHashMap();
Set<String> caseInsensitiveSet = new CaseInsensitiveSet<>();

// Java 21 Sequenced Collections support
SequencedCollection<String> sequenced = CollectionsUtil.newLinkedHashSet();
String first = CollectionsUtil.getFirst(sequenced);
String last = CollectionsUtil.getLast(sequenced);
SequencedCollection<String> reversed = CollectionsUtil.reversed(sequenced);

// Specialized collections

   *
   * @return a new, empty {@code LinkedHashSet}
   */
  @SuppressWarnings("NonApiType") // acts as a direct substitute for a constructor call
  public static <E extends @Nullable Object> LinkedHashSet<E> newLinkedHashSet() {
    return new LinkedHashSet<>();
  }

  /**
   * Creates a <i>mutable</i> {@code LinkedHashSet} instance containing the given elements in order.
   *