| http://digfir-published.macmillanusa.com/hm_custom_osu/hm_digfir_slideactivity.html | Chapter 1. HM DirFir Slide Activity
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| http://digfir-published.macmillanusa.com/hm_custom_osu/hm_digfir_slideactivity_dlap.xml | DLAP questions | 50d0c724b11c0f3c12000000 |