| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_8_037.html | Chapter 1. calc_tutorial_5_8_037
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_8_037_dlap.xml | DLAP questions | 50911702b11c0fd648000000 |