| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_7_044.html | Chapter 1. calc_tutorial_5_7_044
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_7_044_dlap.xml | DLAP questions | 508eaa15b11c0f5f37000000 |