| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_5_033.html | Chapter 1. calc_tutorial_13_5_033
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_5_033_dlap.xml | DLAP questions | 50ca0627b11c0f4d70000000 |