I remember seeing in an Office Hour that there is a way to create Units (chapters bunched together), but I don't remember how to do it.  I've tried in the Remixer and the Re-Remixer, but haven't figured it out.  I'm still in a Sandbox, so maybe that's why I can't seem to do it?  
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Michelle Oja, Ph.D.
Taft College
Behavioral Statistics (Statistics for the Social Sciences)