public static Couple<List<Integer>> parseKeyCodes(String keyCodesText) {
    List<Integer> codes = new ArrayList<>();
    List<Integer> modifiers = new ArrayList<>();

    if (keyCodesText != null) {
      String[] pairs = keyCodesText.split(CODE_DELIMITER);
      for (String each : pairs) {
        String[] strings = each.split(MODIFIER_DELIMITER);
        if (strings.length == 2) {
          codes.add(Integer.valueOf(strings[0]));
          modifiers.add(Integer.valueOf(strings[1]));
        }
      }
    }

    return Couple.of(codes, modifiers);
  }
public static Couple<List<Integer>> parseKeyCodes(String keyCodesText)