docs: private static String convertToRomaji(String katakana)
  			throws EasyJaSubException {
  		try {
  			return Kurikosu.convertKatakanaToRomaji(katakana);
  		} catch (EasyJaSubException ex) {
  			try {
  				return LuceneUtil.katakanaToRomaji(katakana);
  			} catch (Throwable luceneEx) {
  				throw ex;
  			}
  		}
  	}