Date:  15 May 1981 19:04 edt
From:  Greenberg.Symbolics at MIT-Multics
Subject:  Re: New pseudo-cube
To:  Ole at DARCOM-KA (Ole J. Jacobsen)
cc:  Cube-lovers at MIT-MC, Oyvind at DARCOM-KA
In-Reply-To:  Message of 15 May 1981 07:56 edt from Ole J. Jacobsen

I have seen this thing under
the name "space shuttle" - in a cylinder like rubiks cubes used to
come in.  One way to determine the color layou is to make
an assumption (as I did) and proceed to solve-- if you lose, you
get the "impossible" single-pair-swap.  Then swap two edges
of your assumption and try again. Incidentally, the plural
of crux is cruces, not cruxi.