| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_7_007.html | Chapter 1. calc_tutorial_14_7_007
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_7_007_dlap.xml | DLAP questions | 50be1588b11c0fa529000000 |