* static final ImmutableValueGraph<City, Distance> CITY_ROAD_DISTANCE_GRAPH =
   *     ValueGraphBuilder.undirected()
   *         .<City, Distance>immutable()
   *         .putEdgeValue(PARIS, BERLIN, kilometers(1060))
   *         .putEdgeValue(PARIS, BRUSSELS, kilometers(317))
   *         .putEdgeValue(BERLIN, BRUSSELS, kilometers(764))
   *         .addNode(REYKJAVIK)
   *         .build();
   * }</pre>
   *

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          + "metus neque, scelerisque in molestie ac, mattis quis lectus. Pellentesque viverra "
          + "justo commodo quam bibendum ut gravida leo accumsan. Nullam malesuada sagittis diam, "
          + "quis suscipit mauris euismod vulputate. Pellentesque ultrices tellus sed lorem "
          + "aliquet pulvinar. Nam lorem nunc, ultrices at auctor non, scelerisque eget turpis. "

   *     NetworkBuilder.undirected()
   *         .allowsParallelEdges(true)
   *         .<City, Train>immutable()
   *         .addEdge(PARIS, BRUSSELS, Thalys.trainNumber("1111"))
   *         .addEdge(PARIS, BRUSSELS, RegionalTrain.trainNumber("2222"))
   *         .addEdge(LONDON, PARIS, Eurostar.trainNumber("3333"))
   *         .addEdge(LONDON, BRUSSELS, Eurostar.trainNumber("4444"))
   *         .addNode(REYKJAVIK)

    return new HashSet<>(Maps.capacity(expectedSize));
  }

  /**
   * Creates a thread-safe set backed by a hash map. The set is backed by a {@link
   * ConcurrentHashMap} instance, and thus carries the same concurrency guarantees.
   *
   * <p>Unlike {@code HashSet}, this class does NOT allow {@code null} to be used as an element. The
   * set is serializable.
   *
   * @return a new, empty thread-safe {@code Set}

          + "metus neque, scelerisque in molestie ac, mattis quis lectus. Pellentesque viverra "
          + "justo commodo quam bibendum ut gravida leo accumsan. Nullam malesuada sagittis diam, "
          + "quis suscipit mauris euismod vulputate. Pellentesque ultrices tellus sed lorem "
          + "aliquet pulvinar. Nam lorem nunc, ultrices at auctor non, scelerisque eget turpis. "