| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_4_39.html | Chapter 1. calc_tutorial_13_4_39
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_4_39_dlap.xml | DLAP questions | 50d2c916b11c0f4c1e000000 |