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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch9_5.htmlSUMMARY OF KEY IDEAS54ab7a79757a2e235f000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch9_6.htmlEnd of Chapter Questions54ab7a79757a2e235f000000
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