| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_6_013.html | Chapter 1. calc_tutorial_5_6_013
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_6_013_dlap.xml | DLAP questions | 5089739fb11c0fbb22000000 |