Early on:
  for those that know how WWII's enigma machine worked,
  implement it.
  (see ~comp200/01spring/Projects/enigma.ss)


after list-ref, and assoc:
  A randomized headline generator:
  http://www.chron.com/content/interactive/games/headline/headpage.html

  Similarly: an eliza program.


web/xml processing:
  http://www.chron.com/content/chronicle/comics/archive/showComics.hts
  has a list of comic strips -- make your own page where it displays
  your favorites of a given day.

  Alternately -- open up the tx lottery's pages to estimate
  the remaining expected payoff, in scratch-off games.



late, graph-reachability hw:
  make

  length, for lists that might be circular
  (have them draw a picture of such a list,
   and create one,
   and write "length/inf".)

-----
possible exam3 question:
set!/local interaction:
  - a checking-account,
   which whenver it's called with argument "withdraw" changes the balance,
   and returns a list with a receipt# and the new balance.

"draw the picture of what this looks like after 1,2,n iterations:
  [something with set! remainder (rest remainder)]"

example local, with "what is the result of calling..."

write "while"


cyclic? -- using mutation; and/or using accumulator w/ set!
   Or, "reachable? a b"


study sheet: law of local; law of set!