CSC151 2010S, Class 29: Other Forms of List Recursion

Overview:
* Questions 
  * On the exam
  * On material covered over the last few days
  * On the reading for today
* Lab

Admin:
* Reading for Tuesday: Verifying Preconditions.
* I'm back with presents and surprises and more.  
  (Enough that we may continue the surprises on Tuesday and beyond.)
* It's "Not National Pipe Cleaner Day" Day in this section of CSC 151
* EC for Thursday's CS Extra on Drupal. (4:30, 3821)
* EC for Friday's CS Table on a topic yet to be determined. (Noon, JRC PDR)

Questions on the exam
* Can I have an extension for sanity reasons?
  No.  The exam being due on Friday at 5 pm
  (no matter what it says on the exam) should
  suffice.
* For part three, can you give me a hint on how
  to take my procedure that works for one color
  and make it work with the whole image?
  * (image-variant image (lambda (color) 
       (my-helper-procedure ...)))

Questions on material covered over the last few days
* None

Questions on the reading for today
* None