5.20 Use Karnaugh maps to find all possible minimum sum-of-products expressions for each function.
(a) $F(a, b, c) = \Pi M(3, 4)$
(b) $g(d, e, f) = \Sigma m(1, 4, 6) + \Sigma d(0, 2, 7)$
(c) $F(p, q, r) = (p + q' + r)(p' + q + r')$
(d) $F(s, t, u) = \Sigma m(1, 2, 3) + \Sigma d(0, 5, 7)$
(e) $f(a, b, c) = \Pi M(2, 3, 4)$
(f) $G(D, E, F) = \Sigma m(1, 6) + \Sigma d(0, 3, 5)$