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19.3
1.8, page 68
19.3.1
problem 9
19.3.2
problem 10
19.3.3
problem 11
19.3.4
problem 12
19.3.5
problem 13
19.3.6
problem 14
19.3.7
problem 15
19.3.8
problem 16
19.3.9
problem 17
19.3.10
problem 18
19.3.11
problem 19
19.3.12
problem 20
19.3.13
problem 21
19.3.14
problem 22
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