| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_6_016.html | Chapter 1. calc_tutorial_13_6_016
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_6_016_dlap.xml | DLAP questions | 50cb29adb11c0fd779000000 |