@Override
    public String toString() {
      StringBuilder sb = new StringBuilder("[");
      for(int i=Long.SIZE-1; i>=0; i--) {
        sb.append(isSet(myMask, i) ? isSet(myBits, i) ? '1' : '0' : '?');
        if (i != 0 && i % 8 == 0) {
          sb.append(".");
        }
      }
      sb.append("]");
      return sb.toString();
    }
@Override
    public String toString()