| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_17_1_025.html | Chapter 1. calc_tutorial_17_1_025
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_17_1_025_dlap.xml | DLAP questions | 50cd8631b11c0f8802000000 |