56.1.1 problem 1
56.1.2 problem 2
56.1.3 problem 3
56.1.4 problem 4
56.1.5 problem 5
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56.1.8 problem 8
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56.1.10 problem 10
56.1.11 problem 11
56.1.12 problem 12
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56.1.15 problem 15
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56.1.17 problem 17
56.1.18 problem 18
56.1.19 problem 19
56.1.20 problem 20
56.1.21 problem 21
56.1.22 problem 23
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56.1.24 problem 25
56.1.25 problem 26
56.1.26 problem 27
56.1.27 problem 28
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56.1.30 problem 31
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56.1.32 problem 33
56.1.33 problem 34
56.1.34 problem 35
56.1.35 problem 36
56.1.36 problem 37
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56.1.39 problem 40
56.1.40 problem 41
56.1.41 problem 41
56.1.42 problem 42
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56.1.44 problem 44
56.1.45 problem 45
56.1.46 problem 46
56.1.47 problem 47
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56.1.49 problem 49
56.1.50 problem 50
56.1.51 problem 51
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56.1.53 problem 53
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56.1.55 problem 55
56.1.56 problem 56
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56.1.58 problem 58
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56.1.60 problem 60
56.1.61 problem 61
56.1.62 problem 62
56.1.63 problem 63
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56.1.65 problem 65
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56.1.67 problem 67
56.1.68 problem 68
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56.1.70 problem 70
56.1.71 problem 71
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56.1.73 problem 73
56.1.74 problem 74
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56.1.76 problem 76
56.1.77 problem 77
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56.1.79 problem 78
56.1.80 problem 79
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56.1.82 problem 81
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56.1.84 problem 83
56.1.85 problem 84
56.1.86 problem 85
56.1.87 problem 86
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56.1.90 problem 88
56.1.91 problem 89
56.1.92 problem 90