| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_5_023.html | Chapter 1. calc_tutorial_16_5_023
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_5_023_dlap.xml | DLAP questions | 50ccbc01b11c0f2e7c000000 |