Section 27: A(f), D, H, L, P, S
Section 28: B, C, E, F, G, K, O
Section 29: B, D, G, J, M, O
Section 30: A, B, D, H, J, M, P, R, S, V(f)
Section 31: D, E, G, N, O, Q, U
Section 32: B, D(a)(d), E(d), F(c)(e), G(c)
Section 33: C(d)(e), G, I(c),M
Section 39: D, G, F, O(b)(use problem N), S(c) (use problem R), W
Section 40: C, F, K, M, Q, R, U, W
Section 41: C, E, I, J, K, N
Section 42: B, G, N, O, R, S(b), W, Z(a)(b)
Section 43: F, H, I, M, R (you can use P), T, V(a,b,d,e)
Section 44: G, I, K, M, Q, U
Section 45: B, D, F, I, K, N(a), P