| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_4_004.html | Chapter 1. RogaCalcET2 2.4.004.Tutorial.SA.
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_2_4_004_dlap.xml | DLAP questions | 4f8079b3b11c0f6453000001 |