*     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

ountries:["afghanistan","albania","algeria","american samoa","andorra","angola","anguilla","antarctica","antigua and barbuda","argentina","armenia","aruba","australia","austria","azerbaijan","bahamas","bahrain","bangladesh","barbados","belarus","belgium","belize","benin","bermuda","bhutan","bolivia","bonaire","bosnia and herzegovina","botswana","bouvet island","brazil","british indian ocean territory","brunei darussalam","bulgaria","burkina faso","burundi","cabo verde","cambodia","cameroon","canada","cayman...

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