David, The best pat. att. in my 30 years of filing patents: Ron Slusky, rdslusky@verizon.net (mention my name) Best regards Neil Neil J. A. Sloane AT&T Shannon Labs, Room C233, 180 Park Avenue, Florham Park, NJ 07932-0971 Email: njas@research.att.com Office: 973 360 8415; fax: 973 360 8178 Home page: http://www.research.att.com/~njas/