| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_2_028.html | Chapter 1. calc_tutorial_14_2_028
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_2_028_dlap.xml | DLAP questions | 50913eceb11c0f9d4a000000 |