Date: 19 JUL 1980 0346-EDT
From: ALAN at MIT-MC (Alan Bawden)
Subject: OOPS
To: ACW at MIT-AI
CC: CUBE-LOVERS at MIT-MC

Let me suggest the following corrections to your cube language
message.  If any of these are not actual errors, but are actually
misunderstandings on my part, then I apologize for causing undue
confusion, but I thought it would be helpfull to people trying to
understand you system to have these corrected as soom as possible.

    ACW@MIT-AI 07/19/80 01:42:56
    ...

    One more piece of notation: For any manipulations M and N, I write
    M'NM as N[M], reading this as if N were a function: "N of M".

I think you must intend N[M] to mean M N M' .
    ...

    T[I] T'[I'] J' means "Rotate the floor-parallel center-slice a
	quarter turn counter-clockwise as seen from above."

T[I] and T'[I'] don't touch the floor-parallel center-slice at all and
J' rotates it clockwise (as seen from above), my guess is that the
description should simply read: "Rotate the floor-parallel
center-slice a quarter turn clockwise as seen from above."
    ...

    Set Q= (TT)[J] (TT)[ZJ] "Half turn body-slicing center-slice."

This must be a typo or some discarded notation.  My guess is that this
should read Q= (TT)[J] (TT)[J'].  I don't think that the description
here ("Half turn body-slicing center-slice") fits, but it works in
producing the pattern anyway.  If you had said Q= (TT)[J] (TT)[J'] II
then you could get the pattern and fit the description too!