@Test
public void testAdd2() {

    byte[] two = new byte[32];
    two[31] = (byte) 0xff; // 0x000000000000000000000000000000000000000000000000000000000000ff
    DataWord x = DataWord.of(two);
    x = x.add(DataWord.of(two));
    System.out.println(Hex.toHexString(x.getData()));
    DataWord y = DataWord.of(two);
    y = y.add2(DataWord.of(two));
    System.out.println(Hex.toHexString(y.getData()));
}