| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_17_1_004.html | Chapter 1. calc_tutorial_17_1_004
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_17_1_004_dlap.xml | DLAP questions | 50cd8497b11c0fcd02000000 |