2/12. Exercise 12.13

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2/12. Exercise 12.14

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2/12. Exercise 12.15

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2/12. Exercise 12.16

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2/12. Exercise 12.16

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2/12. Exercise 12.17

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2/12. Exercise 12.18

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2/12. Exercise 12.19

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2/12. Exercise 12.20

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2/12. Exercise 12.21

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2/12. Exercise 12.22

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2/12. Exercise 12.23

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