42 might be sitting someplace out there. Now let's think about C complement or the complement of C. C complement, which is the same thing as our universe, minus C, which is the same thing as universe, or you could say the relative complement of C in our universe. These are all equivalent notation. What is this, first of all, in our Venn diagram? What's all this stuff outside of our set? Outside of our set C, right over here. And now all of a sudden we know that negative five, negative five is a member of C, so it can't be a member of C complement.