52.2.1 problem 1
52.2.2 problem 2
52.2.3 problem 3
52.2.4 problem 4
52.2.5 problem 5
52.2.6 problem 6
52.2.7 problem 8
52.2.8 problem 9
52.2.9 problem 10
52.2.10 problem 11
52.2.11 problem 12
52.2.12 problem 13
52.2.13 problem 14
52.2.14 problem 15
52.2.15 problem 16
52.2.16 problem 17
52.2.17 problem 18
52.2.18 problem 19
52.2.19 problem 20
52.2.20 problem 21
52.2.21 problem 22
52.2.22 problem 23
52.2.23 problem 24
52.2.24 problem 25
52.2.25 problem 25
52.2.26 problem 26
52.2.27 problem 27
52.2.28 problem 28
52.2.29 problem 29
52.2.30 problem 30
52.2.31 problem 31
52.2.32 problem 32
52.2.33 problem 33
52.2.34 problem 34
52.2.35 problem 35
52.2.36 problem 36
52.2.37 problem 37
52.2.38 problem 38
52.2.39 problem 39
52.2.40 problem 40
52.2.41 problem 41
52.2.42 problem 42
52.2.43 problem 43
52.2.44 problem 44
52.2.45 problem 45
52.2.46 problem 46
52.2.47 problem 47
52.2.48 problem 48
52.2.49 problem 49