| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_2_038.html | Chapter 1. calc_tutorial_16_2_038
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_2_038_dlap.xml | DLAP questions | 50cb791cb11c0fa87b000000 |