Scott Huddleston writes:

The Cartalk Puzzler this week looks interesting. Puzzle and URL: <http://cartalk.cars.com/Radio/Puzzler/Transcripts/200305/index.html>

The puzzle previously appeared in the IBM Research "Ponder This" puzzle section. See <http://www.research.ibm.com/ponder/> under July 2002. Dan Hoey@AIC.NRL.Navy.Mil