| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_3_006.html | Chapter 1. calc_tutorial_15_3_006
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_3_006_dlap.xml | DLAP questions | 50c1f0efb11c0f0742000000 |