return this.getCount() == that.getCount()
            && Objects.equal(this.getElement(), that.getElement());
      }
      return false;
    }

    /**
     * Return this entry's hash code, following the behavior specified in {@link
     * Multiset.Entry#hashCode}.
     */
    @Override
    public int hashCode() {
      E e = getElement();
      return ((e == null) ? 0 : e.hashCode()) ^ getCount();
    }

          ToOptionalState::new,
          (state, o) -> state.add((o == null) ? NULL_PLACEHOLDER : o),
          ToOptionalState::combine,
          state -> {
            Object result = state.getElement();
            return (result == NULL_PLACEHOLDER) ? null : result;
          },
          Collector.Characteristics.UNORDERED);

  /**

      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() {

    long[] cumulativeCounts = new long[entries.size() + 1];
    int i = 0;
    for (Entry<E> entry : entries) {
      elementsBuilder.add(entry.getElement());
      cumulativeCounts[i + 1] = cumulativeCounts[i] + entry.getCount();
      i++;
    }
    return new RegularImmutableSortedMultiset<>(

        Multiset.Entry<K> transform(final Map.Entry<K, Collection<V>> backingEntry) {
          return new Multisets.AbstractEntry<K>() {
            @Override
            @ParametricNullness
            public K getElement() {
              return backingEntry.getKey();
            }

            @Override
            public int getCount() {
              return backingEntry.getValue().size();
            }