}

      @Override
      public E next() {
        if (remaining <= 0) {
          Entry<E> entry = entryIterator.next();
          element = entry.getElement();
          remaining = entry.getCount();
        }
        remaining--;
        /*
         * requireNonNull is safe because `remaining` starts at 0, forcing us to initialize

      Collection<? extends Entry<? extends E>> entries) {
    ImmutableMultiset.Builder<E> builder = new ImmutableMultiset.Builder<E>(entries.size());
    for (Entry<? extends E> entry : entries) {
      builder.addCopies(entry.getElement(), entry.getCount());
    }
    return builder.build();
  }

  ImmutableMultiset() {}

  @Override
  public UnmodifiableIterator<E> iterator() {