| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_8_008.html | Chapter 1. calc_tutorial_5_8_008
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_5_8_008_dlap.xml | DLAP questions | 508ec5d1b11c0f7f38000000 |