| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_4_017.html | Chapter 1. calc_tutorial_15_4_017
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_4_017_dlap.xml | DLAP questions | 50c736dfb11c0f2561000000 |