* null values only.
   *
   * @return immutable set of column keys
   */
  @Override
  public ImmutableSet<C> columnKeySet() {
    return columnKeyToIndex.keySet();
  }

  @LazyInit private transient @Nullable ColumnMap columnMap;

  @Override
  public Map<C, Map<R, @Nullable V>> columnMap() {
    ColumnMap map = columnMap;
    return (map == null) ? columnMap = new ColumnMap() : map;
  }

      Iterable<? extends Entry<? extends K, ? extends V>> entries) {
    return ImmutableListMultimap.copyOf(entries);
  }

  final transient ImmutableMap<K, ? extends ImmutableCollection<V>> map;
  final transient int size;

  // These constants allow the deserialization code to set final fields. This
  // holder class makes sure they are not initialized unless an instance is
  // deserialized.

      }
    }
  }

  @Override
  public Set<R> rowKeySet() {
    return rowMap().keySet();
  }

  @LazyInit private transient @Nullable Set<C> columnKeySet;

  /**
   * {@inheritDoc}
   *
   * <p>The returned set has an iterator that does not support {@code remove()}.
   *

    if (result != null) {
      return result;
    } else {
      return defaultValue;
    }
  }

  @LazyInit @RetainedWith private transient @Nullable ImmutableSet<Entry<K, V>> entrySet;

  /**
   * Returns an immutable set of the mappings in this map. The iteration order is specified by the

    private static final long serialVersionUID = 1L;

    protected volatile Pattern[] includedDocUrlPatterns;

    protected volatile Pattern[] excludedDocUrlPatterns;

    protected transient volatile Map<ConfigName, Map<String, String>> configParameterMap;

    protected CrawlerClientFactory crawlerClientFactory = null;

    public WebConfig() {
        setBoost(1.0f);
    }

    @Override

  private static final int DEFAULT_VALUE_SET_CAPACITY = 2;
  @VisibleForTesting static final double VALUE_SET_LOAD_FACTOR = 1.0;

  @VisibleForTesting transient int valueSetCapacity;
  private transient MultimapIterationChain<K, V> multimapIterationChain =
      new MultimapIterationChain<>();

  private LinkedHashMultimap(int keyCapacity, int valueSetCapacity) {

         * `element` above. After that, we never clear it.
         */
        return requireNonNull(element);
      }
    };
  }

  @LazyInit private transient @Nullable ImmutableList<E> asList;

  @Override
  public ImmutableList<E> asList() {
    ImmutableList<E> result = asList;
    return (result == null) ? asList = super.asList() : result;
  }

  @Override

 */
@GwtIncompatible
@J2ktIncompatible
@ReflectionSupport(value = ReflectionSupport.Level.FULL)
public class AtomicDouble extends Number {
  private static final long serialVersionUID = 0L;

  private transient volatile long value;

  private static final AtomicLongFieldUpdater<AtomicDouble> updater =
      AtomicLongFieldUpdater.newUpdater(AtomicDouble.class, "value");

  /**

#### Shared reader thread

    TreeMultiset<E> multiset = create();
    Iterables.addAll(multiset, elements);
    return multiset;
  }

  private final transient Reference<AvlNode<E>> rootReference;
  private final transient GeneralRange<E> range;
  private final transient AvlNode<E> header;

  TreeMultiset(Reference<AvlNode<E>> rootReference, GeneralRange<E> range, AvlNode<E> endLink) {
    super(range.comparator());