33.1 problem 830
33.2 problem 831
33.3 problem 832
33.4 problem 833
33.5 problem 834
33.6 problem 835
33.7 problem 836
33.8 problem 837
33.9 problem 838
33.10 problem 839
33.11 problem 840
33.12 problem 841
33.13 problem 842
33.14 problem 843
33.15 problem 844
33.16 problem 845
33.17 problem 846