Problem set 9: [1-4] [5,6] [7,8a(i)] [8a(ii)] [8b(i)] [8b(ii)] [8c,8d(i)] [8d(ii)]

Problem set 9: [1-4] [5,6] [7,8a(i)] [8a(ii)] [8b(i)] [8b(ii)] [8c,8d(i)] [8d(ii)]