(8) In each case give an example of sets S, T C R satisfying the given conditions. (Be sure to demonstrate that your sets do, in fact, sastify the conditions.) (a) S,T are infinite, but Sn T has exaclty 5 elements. (b) S is infinite, but S" is finite and non-empty. (c) S,T are open intervals, and SUT = (a, b) where a