I'm headed off to Maui for three weeks. Michael Kleber [michael.kleber@gmail.com] will be the temporary moderator. --- I've changed my email address. The new address is rcs@xmission.com. The old address (16 years), rcs@cs.arizona.edu, will forward for a while. I also have a "permanent" address at schroeppel@alum.mit.edu. Rich