public static String asAlphaNumericLower(int i) {
        return asAlphaNumeric(i).toLowerCase(Locale.ROOT);
    }
@Test
    public void testAlphaLower() {
        assertEquals("a", AutoPageNumberUtils.asAlphaNumericLower(1));
        assertEquals("z", AutoPageNumberUtils.asAlphaNumericLower(26));
        assertEquals("aa", AutoPageNumberUtils.asAlphaNumericLower(27));
        assertEquals("zz", AutoPageNumberUtils.asAlphaNumericLower(52));
        assertEquals("aaa", AutoPageNumberUtils.asAlphaNumericLower(53));
        assertEquals("zzz", AutoPageNumberUtils.asAlphaNumericLower(78));
    }