| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_3_017.html | Chapter 1. calc_tutorial_15_3_017
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_3_017_dlap.xml | DLAP questions | 50c89cf0b11c0f5764000000 |