| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_1_045.html | Chapter 1. calc_tutorial_14_1_045
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_1_045_dlap.xml | DLAP questions | 50b8c7c9b11c0fef16000000 |