| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_3_057.html | Chapter 1. calc_tutorial_14_3_057
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_3_057_dlap.xml | DLAP questions | 509165b2b11c0fdb4b000000 |