And so eight times eight, and actually even the drops, you can view them as canceling out if you view them as units, so drops, drops. Eight times eight is equal to 64 people. So they could have written literally the number 64 right over here. 64 people have type O positive blood. Now let's think about the O negative case. O negative blood. Well this is O, and then within the blood group O, this is O negative, and we have one drops, two drops.