code: public static String stemmedInsensitiveGroupingKey(TermWord termWord) {
  		return StringUtils.replaceAccents(String.format(
  				STEMMED_INSENSITIVE_GKEY_FORMAT, 
  				termWord.getSyntacticLabel(), 
  				termWord.getWord().getStem()).toLowerCase());
  	}
docs: e.g. a: Hydroélectrique -> a: hydroelectric