a little bit at the beginning so the netcode links though are the net amount of change to this to the length of this bit stream is well that's a negative log P of X given Z minus log P of Z so that was furred for these two parts two and three but then we had to subtract the amount that we we decoded from the bit stream at the beginning I was so that's plus log excuse me for the next and the first part Z gives you some sample from Q so the actual code length on average is is the average of this of received Ron from the approximate posterior so