| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_1_014.html | Chapter 1. calc_tutorial_13_1_014
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_1_014_dlap.xml | DLAP questions | 50c8bb29b11c0fb767000000 |