| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_2_025.html | Chapter 1. calc_tutorial_13_2_025
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_2_025_dlap.xml | DLAP questions | 50c8ce96b11c0f2d68000000 |