static final String LOREM_IPSUM =
      "Lorem ipsum dolor sit amet, consectetur adipiscing "
          + "elit. Cras fringilla elit ac ipsum adipiscing vulputate. Maecenas in lorem nulla, ac "
          + "sollicitudin quam. Praesent neque elit, sodales quis vestibulum vel, pellentesque nec "
          + "erat. Proin cursus commodo lacus eget congue. Aliquam erat volutpat. Fusce ut leo sed "

  static final String LOREM_IPSUM =
      "Lorem ipsum dolor sit amet, consectetur adipiscing "
          + "elit. Cras fringilla elit ac ipsum adipiscing vulputate. Maecenas in lorem nulla, ac "
          + "sollicitudin quam. Praesent neque elit, sodales quis vestibulum vel, pellentesque nec "
          + "erat. Proin cursus commodo lacus eget congue. Aliquam erat volutpat. Fusce ut leo sed "

      createUndirectedGraph("ba", "ad", "be", "ac", "ec", "cf");

  /**
   * A diamond shaped directed graph (arrows going down):
   *
   * <pre>{@code
   *   a
   *  / \
   * b   c
   *  \ /
   *   d
   * }</pre>
   */
  private static final SuccessorsFunction<Character> DIAMOND_GRAPH =
      createDirectedGraph("ab", "ac", "bd", "cd");

  /**

      createUndirectedGraph("ba", "ad", "be", "ac", "ec", "cf");

  /**
   * A diamond shaped directed graph (arrows going down):
   *
   * <pre>{@code
   *   a
   *  / \
   * b   c
   *  \ /
   *   d
   * }</pre>
   */
  private static final SuccessorsFunction<Character> DIAMOND_GRAPH =
      createDirectedGraph("ab", "ac", "bd", "cd");

  /**

          "uomi-online.kir.jp",
          "jprs.co.jp",
          "site.quick.jp",
          "site.tenki.jp",
          "site.or.jp",
          "site.gr.jp",
          "site.ne.jp",
          "site.ac.jp",
          "site.ad.jp",
          "site.ed.jp",
          "site.geo.jp",
          "site.go.jp",
          "site.lg.jp",
          "1.fm",
          "site.cc",
          "site.ee",

          "uomi-online.kir.jp",
          "jprs.co.jp",
          "site.quick.jp",
          "site.tenki.jp",
          "site.or.jp",
          "site.gr.jp",
          "site.ne.jp",
          "site.ac.jp",
          "site.ad.jp",
          "site.ed.jp",
          "site.geo.jp",
          "site.go.jp",
          "site.lg.jp",
          "1.fm",
          "site.cc",
          "site.ee",

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