Section 15.10 Exercise 4
Section 15.10 Exercise 14
Section 16.11 Exercise 7
Section 16.11 Exercise 9
Section 17.11 Exercise 4
Section 17.11 Exercise 6
Section 9.9 Exercise 1
Section 10.16 Exercise 3
Section 11.10 Exercise 2
Section 12.15 Exercise 5
Section 13.10 Exercise 6
Section 6.13 Exercise 3
Section 7.12 Exercise 4
Section 8.9 Exercise 5
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