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25 Exercise 43, page 209

25.1 problem 1
25.2 problem 1
25.3 problem 2
25.4 problem 3
25.5 problem 4
25.6 problem 5
25.7 problem 6
25.8 problem 7
25.9 problem 8
25.10 problem 9
25.11 problem 10
25.12 problem 11
25.13 problem 12
25.14 problem 13
25.15 problem 14

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