code: private void skipCountry() {
          if (!atTerminator()) {
              if (id[index] == UNDERSCORE || id[index] == HYPHEN) {
                  ++index;
              }
              /*
               * Save the index point after the separator, since the format
               * requires two separators if the country is not present.
               */
              int oldIndex = index;
  
              skipUntilTerminatorOrIDSeparator();
              int charsSkipped = index - oldIndex;
              if (charsSkipped < 2 || charsSkipped > 3) {
                  index = oldIndex;
              }
          }
      }
docs: Advance index past country.
  Index must be immediately after the script (if there is one, else language)
  and IDSeparator.