Percent chance. So that's the probability of B. So let's see if we can clean this up a little bit, just because I don't think we need all of this writing now. I think we're ready to substitute into our Bayes formula, which we, Bayes' theorem that we re-derived. Recording longer videos is dangerous, because if I make a mistake, that's more time wasted. I don't want to delete anything that could be useful. OK.