Okay, now let's move on to this case. We have x uppercase B-Y-X lowercase b. X lowercase b. If we carry out the punning square, we'll see that these individuals do in fact work. So because X B can be donated by one parent, XB can be donated by the other parent. So we can in fact form this individual. And likewise, if the Y is donated by the male parent, XB is donated by the other one, we form this individual right over here.