56.4.1 problem 1
56.4.2 problem 2
56.4.3 problem 3
56.4.4 problem 4
56.4.5 problem 5
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56.4.8 problem 8
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56.4.10 problem 10
56.4.11 problem 11
56.4.12 problem 12
56.4.13 problem 13
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56.4.15 problem 15
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56.4.18 problem 18
56.4.19 problem 19
56.4.20 problem 20
56.4.21 problem 21
56.4.22 problem 22
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56.4.24 problem 24
56.4.25 problem 24
56.4.26 problem 24
56.4.27 problem 24
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56.4.30 problem 26
56.4.31 problem 27
56.4.32 problem 28
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56.4.34 problem 31
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56.4.36 problem 33
56.4.37 problem 34
56.4.38 problem 35
56.4.39 problem 36
56.4.40 problem 37
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56.4.43 problem 40
56.4.44 problem 41
56.4.45 problem 42
56.4.46 problem 43
56.4.47 problem 44
56.4.48 problem 45
56.4.49 problem 46
56.4.50 problem 47
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56.4.52 problem 49
56.4.53 problem 50
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56.4.56 problem 53
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56.4.58 problem 55
56.4.59 problem 56
56.4.60 problem 57
56.4.61 problem 58
56.4.62 problem 59
56.4.63 problem 60
56.4.64 problem 61
56.4.65 problem 62
56.4.66 problem 63
56.4.67 problem 64
56.4.68 problem 65
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56.4.70 problem 67
56.4.71 problem 68
56.4.72 problem 69