Integer result = size;
      if (result == null) {
        long total = 0;
        for (Range<C> range : ranges) {
          total += ContiguousSet.create(range, domain).size();
          if (total >= Integer.MAX_VALUE) {
            break;
          }
        }
        result = size = Ints.saturatedCast(total);
      }
      return result.intValue();
    }

    @Override

  public static <E> ImmutableSet<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E... others) {
    checkArgument(
        others.length <= Integer.MAX_VALUE - 6, "the total number of elements must fit in an int");
    final int paramCount = 6;
    Object[] elements = new Object[paramCount + others.length];
    elements[0] = e1;
    elements[1] = e2;
    elements[2] = e3;

  public static <E> ImmutableList<E> of(
      E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10, E e11, E e12, E... others) {
    checkArgument(
        others.length <= Integer.MAX_VALUE - 12, "the total number of elements must fit in an int");
    Object[] array = new Object[12 + others.length];
    array[0] = e1;
    array[1] = e2;
    array[2] = e3;
    array[3] = e4;
    array[4] = e5;
    array[5] = e6;

   *
   * <p>Retrieving a single element takes approximately O(log(M)) time, where M is the number of
   * iterators. (Retrieving all elements takes approximately O(N*log(M)) time, where N is the total
   * number of elements.)
   */
  private static class MergingIterator<T extends @Nullable Object> extends UnmodifiableIterator<T> {
    final Queue<PeekingIterator<T>> queue;

    public MergingIterator(