| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_1_040.html | Chapter 1. calc_tutorial_15_1_040
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_1_040_dlap.xml | DLAP questions | 50c0e5deb11c0f543c000000 |