*     GraphBuilder.undirected()
   *         .<Country>immutable()
   *         .putEdge(FRANCE, GERMANY)
   *         .putEdge(FRANCE, BELGIUM)
   *         .putEdge(GERMANY, BELGIUM)
   *         .addNode(ICELAND)
   *         .build();
   * }</pre>
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build

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// xn--3pxu8k : 2015-01-15 VeriSign Sarl
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// xn--42c2d9a : 2015-01-15 VeriSign Sarl
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// xn--45q11c : 2013-11-21 Zodiac Gemini Ltd
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// xn--55qw42g : 2013-11-08 China Organizational Name Administration Center
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// xn--55qx5d : 2013-11-14 China Internet Network Information Center (CNNIC)
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