@Override
  NavigableSet<Integer> createUnfiltered(Iterable<Integer> contents) {
    return Sets.newTreeSet(contents);
  }

  @Override
  NavigableSet<Integer> filter(
      NavigableSet<Integer> elements, Predicate<? super Integer> predicate) {
    return Sets.filter(elements, predicate);
  }

  }

  // Node/edge sets are the same, but node/edge connections differ due to edge type.
  @Test
  public void equivalent_directedVsUndirected() {
    graph.putEdge(N1, N2);

    MutableGraph<Integer> g2 = createGraph(oppositeType(edgeType));
    g2.putEdge(N1, N2);

    assertThat(graph).isNotEqualTo(g2);
  }

  // Node/edge sets and node/edge connections are the same, but directedness differs.

  }

  // Node/edge sets are the same, but node/edge connections differ due to edge type.
  @Test
  public void equivalent_directedVsUndirected() {
    graph.putEdge(N1, N2);

    MutableGraph<Integer> g2 = createGraph(oppositeType(edgeType));
    g2.putEdge(N1, N2);

    assertThat(graph).isNotEqualTo(g2);
  }

  // Node/edge sets and node/edge connections are the same, but directedness differs.

  final class EntrySet extends Entries implements Set<Entry<K, V>> {
    @Override
    public int hashCode() {
      return Sets.hashCodeImpl(this);
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return Sets.equalsImpl(this, obj);
    }
  }

  abstract Iterator<Entry<K, V>> entryIterator();

  @LazyInit private transient @Nullable Set<K> keySet;

  @Override

     *
     * @return the sortPrefix
     */
    public String getSortPrefix() {
        return sortPrefix;
    }

    /**
     * Sets the sort prefix used for identifying sort parameters in search queries.
     *
     * @param sortPrefix the sortPrefix to set
     */
    public void setSortPrefix(final String sortPrefix) {
        this.sortPrefix = sortPrefix;
    }

    /**

        }
    }

    /**
     * Gets the new input word.
     *
     * @return The new input word.
     */
    public String getNewInput() {
        return newInput;
    }

    /**
     * Sets the new input word.
     *
     * @param newInput The new input word.
     */
    public void setNewInput(final String newInput) {
        this.newInput = newInput;
    }

    /**

    /**
     * Updates crawling information parameters for the specified session.
     * Sets the name and expiration time based on the provided parameters.
     *
     * @param sessionId the session ID to update
     * @param name the name to set for the crawling session (uses system name if blank)
     * @param dayForCleanup number of days until cleanup (sets expiration if >= 0)

    return (Set<Entry<K, V>>) super.entries();
  }

  @Override
  Set<Entry<K, V>> createEntries() {
    return new EntrySet();
  }

  private final class EntrySet extends Entries implements Set<Entry<K, V>> {
    @Override
    public int hashCode() {
      return Sets.hashCodeImpl(this);
    }

    @Override
    public boolean equals(@Nullable Object o) {

        }
    }

    /**
     * Returns the new token.
     *
     * @return The new token.
     */
    public String getNewToken() {
        return newToken;
    }

    /**
     * Sets the new token.
     *
     * @param newToken The new token.
     */
    public void setNewToken(final String newToken) {
        this.newToken = newToken;
    }

    /**
     * Returns the new segmentation.

  @Beta // TODO: b/288085449 - Remove @Beta after we're sure that Java 8 APIs are safe for Android
  public FakeTicker advance(Duration duration) {
    return advance(duration.toNanos());
  }

  /**
   * Sets the increment applied to the ticker whenever it is queried.
   *
   * <p>The default behavior is to auto increment by zero. i.e: The ticker is left unchanged when
   * queried.
   */