So once we carry out the process, let's actually count up the squares that have all six upper case letters. And notice if we go through each and every one of these, only one of these zygotes. So one out of 64 possibilities will contain this case. So this is the only zygote, the only square that contains all upper case six letters. And so we place a six. Now, by the way, there are a total of 64 cases because eight multiplied by eight gives us 64.