| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_5_006.html | Chapter 1. calc_tutorial_16_5_006
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_5_006_dlap.xml | DLAP questions | 50ccbaf9b11c0f4d7d000000 |