| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_7_021.html | Chapter 1. calc_tutorial_5_7_021
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_7_021_dlap.xml | DLAP questions | 508e8be3b11c0ffb36000000 |