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Exercise 1 (Page 139) ​

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Exercise 2 (Page 140) ​

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Exercise 3 (Page 140) ​

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Exercise 4 (Page 140) ​

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Exercise 5 (Page 141) ​

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Exercise 6 (Page 142) ​

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Exercise 7 (Page 142) ​

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Exercise 8 (Page 142) ​

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