From cube-lovers-errors@mc.lcs.mit.edu Thu Mar 25 19:29:58 1999 Return-Path: Received: from sun28.aic.nrl.navy.mil (sun28.aic.nrl.navy.mil [132.250.84.38]) by mc.lcs.mit.edu (8.9.1a/8.9.1-mod) with SMTP id TAA08877 for ; Thu, 25 Mar 1999 19:29:58 -0500 (EST) Precedence: bulk Errors-To: cube-lovers-errors@mc.lcs.mit.edu Date: Thu, 25 Mar 1999 21:59:53 +0000 From: David Singmaster To: jbryan@pstcc.cc.tn.us Cc: cube-lovers@ai.mit.edu Message-Id: <009D5A93.46B93D17.11@ice.sbu.ac.uk> Subject: RE: Re : RE: parity pairs If one really wants trouble with cube colors being indistinguishable try solving under a sodium vapor street lamp. I found this gave two colors: grey and greyer! DAVID SINGMASTER, Professor of Mathematics and Metagrobologist School of Computing, Information Systems and Mathematics Southbank University, London, SE1 0AA, UK. Tel: 0171-815 7411; fax: 0171-815 7499; email: zingmast or David.Singmaster @sbu.ac.uk