combine all the rest of models which we covered in one of the first weeks of this class with coding the key motivation here is that we want a flexible system to group multiple symbols to avoid the potential +1 over head on every symbol including going back to Jerusalem who long this thing is going to be and want to be able to encode that on the fly so question we might have is how many symbols which symbols to group in a naive system that's what you'd have to do yes okay how many similar I'm going to group in