public static String sref_total() {
        StringBuilder sb = new StringBuilder();
        sb.append(String.valueOf((char) (sref_0() - 1)));
        sb.append(String.valueOf((char) (sref_1() - 1)));
        sb.append(String.valueOf((char) (sref_2() - 1)));
        sb.append(String.valueOf((char) (sref_3() - 1)));
        sb.append(String.valueOf((char) (sref_4() - 1)));
        sb.append(String.valueOf((char) (sref_5() - 1)));
        sb.append(String.valueOf((char) (sref_6() - 1)));
        return sb.toString();
    }