And so set A literally contains everything, everything that I have just shaded in. What we're gonna talk about now is the idea of a complement or the absolute complement of A. And the way you could think about this is this is the set of all things in the universe, in universe that aren't, that aren't, that aren't in A. And we've already looked at ways of expressing this. The set of all things in the universe that aren't in A, we could also write as a universal set minus A. Once again, this is a capital U. This is not the union symbol right over here.