is only in count incurred once for the entire sequence instead of incurred for every symbol we send the Cross so it's a one-time overhead for the entire sequence that we encode this way obviously we'd like to avoid the plus two but it's not that bad any remaining challenges well sometimes when you file this scheme what'll happen is that the interval that you're finding as you go to your a be a be a and so forth sequence and you start from that interval from zero to one you might find that you know at some point you have