http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_3_022.html\tChapter 1. calc_tutorial_14_3_022
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http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_14_3_022_dlap.xml\tDLAP questions\t50915040b11c0fc24a000000