| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_2_015.html | Chapter 1. calc_tutorial_16_2_015
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_2_015_dlap.xml | DLAP questions | 50cb4a5eb11c0f717a000000 |