| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_3_003.html | Chapter 1. calc_tutorial_13_3_003
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_3_003_dlap.xml | DLAP questions | 50c995b6b11c0fb06c000000 |