@ParametricNullness
      K transform(Entry<K, V> entry) {
        return entry.getKey();
      }
    };
  }

  static <K extends @Nullable Object, V extends @Nullable Object> Iterator<V> valueIterator(
      Iterator<Entry<K, V>> entryIterator) {
    return new TransformedIterator<Entry<K, V>, V>(entryIterator) {
      @Override
      @ParametricNullness
      V transform(Entry<K, V> entry) {

      @ParametricNullness
      K transform(Entry<K, V> entry) {
        return entry.getKey();
      }
    };
  }

  static <K extends @Nullable Object, V extends @Nullable Object> Iterator<V> valueIterator(
      Iterator<Entry<K, V>> entryIterator) {
    return new TransformedIterator<Entry<K, V>, V>(entryIterator) {
      @Override
      @ParametricNullness
      V transform(Entry<K, V> entry) {

    }
  }

  final class KeyIterator extends HashIterator<K> {

    @Override
    public K next() {
      return nextEntry().getKey();
    }
  }

  final class ValueIterator extends HashIterator<V> {

    @Override
    public V next() {
      return nextEntry().getValue();
    }
  }

  /**

    }
  }

  final class KeyIterator extends HashIterator<K> {

    @Override
    public K next() {
      return nextEntry().getKey();
    }
  }

  final class ValueIterator extends HashIterator<V> {

    @Override
    public V next() {
      return nextEntry().getValue();
    }
  }

  /**

    Collection<V> result = values;
    return (result == null) ? values = createValues() : result;
  }

  Collection<V> createValues() {
    return new Values();
  }

  Iterator<V> valuesIterator() {
    return new TransformedIterator<Cell<R, C, V>, V>(cellSet().iterator()) {
      @Override
      @ParametricNullness
      V transform(Cell<R, C, V> cell) {
        return cell.getValue();
      }

    Collection<V> result = values;
    return (result == null) ? values = createValues() : result;
  }

  Collection<V> createValues() {
    return new Values();
  }

  Iterator<V> valuesIterator() {
    return new TransformedIterator<Cell<R, C, V>, V>(cellSet().iterator()) {
      @Override
      @ParametricNullness
      V transform(Cell<R, C, V> cell) {
        return cell.getValue();
      }

      Map<K, Iterator<V>> valueIterators = new HashMap<>();
      for (int i = 0; i < elements.length; i++) {
        @SuppressWarnings("unchecked") // These come from Entry<K, V> objects somewhere.
        K key = (K) elements[i];

        Iterator<V> valueItr = valueIterators.get(key);
        if (valueItr == null) {
          valueIterators.put(key, valueItr = sampleValuesIterator());
        }

  }

  @WeakOuter
  class ValuesView extends Maps.Values<K, V> {
    ValuesView() {
      super(CompactHashMap.this);
    }

    @Override
    public Iterator<V> iterator() {
      return valuesIterator();
    }

    @Override
    public void forEach(Consumer<? super V> action) {
      checkNotNull(action);
      Map<K, V> delegate = delegateOrNull();
      if (delegate != null) {

  public ImmutableCollection<V> values() {
    return (ImmutableCollection<V>) super.values();
  }

  @Override
  abstract ImmutableCollection<V> createValues();

  @Override
  final Iterator<V> valuesIterator() {
    throw new AssertionError("should never be called");
  }

  /**
   * {@inheritDoc}
   *
   * @throws NullPointerException if {@code columnKey} is {@code null}
   */
  @Override

  public ImmutableCollection<V> values() {
    return (ImmutableCollection<V>) super.values();
  }

  @Override
  abstract ImmutableCollection<V> createValues();

  @Override
  final Iterator<V> valuesIterator() {
    throw new AssertionError("should never be called");
  }

  /**
   * {@inheritDoc}
   *
   * @throws NullPointerException if {@code columnKey} is {@code null}
   */
  @Override