From dik@cwi.nl  Sun Jan  8 19:08:05 1995
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Date: Mon, 9 Jan 1995 01:07:55 +0100
From: Dik.Winter@cwi.nl
Message-Id: <9501090007.AA02883=dik@boring.cwi.nl>
To: cube-lovers@ai.mit.edu, mreid@ptc.com
Subject: Re:  two stage filtration

[ Mike: You need not visit all neighbors when going backwards. ]

Right you are; I missed that completely.

dik