So we want to find the relative complement of this business in A. So now I'll just actually write out the set. 3, 7, negative 5, 13. Actually, let me write out both of them, just to make it, just so that we can really just visualize them both right over here. So A is this. It is 3, 7, negative 5, 0, and 13. And I could write the relative complement sign.