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

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

  /**

          "it-trace.ch",
          "jobs.kt.com.",
          "jprs.co.jp",
          "kt.co",
          "ledger-enquirer.com",
          "members.blah.nl.",
          "pvt.k12.ca.us",
          "site.ac.jp",
          "site.ad.jp",
          "site.cc",
          "site.ed.jp",
          "site.ee",
          "site.fi",
          "site.fm",
          "site.geo.jp",
          "site.go.jp",

// HIGH RISK ACTIVITIES.
//
//
// The rest is:
//
// Copyright (C) 1996 by Jef Poskanzer <******@****.***>.  All rights reserved.
//
// Copyright (C) 1996 by Wolfgang Platzer
// email: ******@****.***-graz.ac.at
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:

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