Date: 11 August 1980 15:17 edt From: Greenberg.Multics at MIT-Multics Subject: Re: Edge-cubie flipping algorithms To: McKeeman at PARC-Maxc cc: Davis at OFFICE-3, CUBE-LOVERS at MIT-MC In-Reply-To: Message of 11 August 1980 12:51 edt from McKeeman Yes, indeed, you can express Q as U'DJ', that's legit. I can't see any way you can count (FQ)^4 as more than 24 quarter turns, for thats all it is. In the eyes of the people who count turns, not quarter turns, the QQ in the middle (4 quarter turns) can be expressed as U^2D^2, where U^2 and D^2 each count as one, which could be thus contributory to counting the formula as 22 turns, but surely no more than 24 by any kind of metric. By the way, my description of the left-handed wrench in the annotations was in error, it should have been (F'Q)^4, not (FQ')^4. (The formula (FQ)^4(QF)^4 is correct as stands).