For example, let's suppose we look at this one. So for this particular zygote, we combine an excel that contains all lowercase letters, a sperm cell that contains all uppercase letters, and we form three uppercase letters and three lowercase letters. So uppercase A, lowercase A, upper case B, lowercase B, and uppercase C, lowercase C, and we do this with every single one of these squares. 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.