TeachScheme! 2000

  Assignment: have them transform their own ancestor tree into a
               descendant tree

  Assignments: 15.1.3, p209
               15.1.4, p209

  catch up from Wednesday, if necessary 

  Options:

   [Utah lab didn't use this option]
   work thru rest of Binary Search tree
    14.2.3
    14.2.4
    14.2.5 

   [Utah lab used this option for a few people]
   work thru simulated Web pages: 
    14.3.1
    14.3.2
    14.3.3
    14.3.4