And that would be the numbers 5, 3, and 12. Now, when we visualized this as B subtracted from A, you might be saying, hey, wait, look, look. OK, I could imagine you took the 17 out, you took the 19 out, but what about taking the 6 out? Maybe you've taken a 6 out, or in traditional subtraction, maybe we would end up with a negative number or something. And when you subtract a set, if the set you're subtracting from does not have that element, then taking that element out of it doesn't change it. If I start with set A and take a 6, if I take all the 6s out of set A, it doesn't change it. There was no 6 to begin with.