| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_1_027.html | Chapter 1. calc_tutorial_13_1_027
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_1_027_dlap.xml | DLAP questions | 50c8c336b11c0fdd67000000 |