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50.5 section 5.0

50.5.1 problem 1
50.5.2 problem 2
50.5.3 problem 3
50.5.4 problem 4
50.5.5 problem 5
50.5.6 problem 6
50.5.7 problem 7
50.5.8 problem 8
50.5.9 problem 9
50.5.10 problem 10
50.5.11 problem 11
50.5.12 problem 12
50.5.13 problem 13
50.5.14 problem 14
50.5.15 problem 15
50.5.16 problem 16
50.5.17 problem 17
50.5.18 problem 18
50.5.19 problem 19
50.5.20 problem 20
50.5.21 problem 21
50.5.22 problem 22
50.5.23 problem 23

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