the joint which is basically the co-occurrence and so that gets you that count that's basically looking it up directly from that table the IJ entry for XY and then you normal by this kind of baseline assumption which is that the words should not Co occur more than by chance so that would be just their gonna depend of probabilities multiplied together as you can imagine those may be quite small and product into two gether makes them even smaller but some words co-occur together so a mirror occurs with reflective or