Joshua Zucker plugged http://sanjosemathcircle.org . Would they be willing guinea pigs for my latest disk puzzle? (http://gosper.org/Arnold.rtf .) I'm anxious to know if it has multiple solutions. Regrettably, Octave (http://gosper.org/octav2.rtf) and Twubblesome Twelve (home page) do. http://gosper.org/7^3leg.rtf has 7.9 million solutions (thanks for counting, Mike Beeler) but is nevertheless difficult (and more instructive than the disk puzzles, which are just hard). This invitation extends to all funsters handy to the South Bay. --rwg PS, I assume the Math Circle leaders have checked out www.tweedledum.com/rwg/ for useful material. --------------------------------- Shape Yahoo! in your own image. Join our Network Research Panel today!