| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_4_010.html | Chapter 1. calc_tutorial_16_4_010
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_4_010_dlap.xml | DLAP questions | 50ccb79ab11c0f877c000001 |