At least 2 errors appeared in my previous message:
In Minh Thai's 3-cycle, substitute "r" for "f" to do the permutation
In the Frye 3-cycle, the first "d" should be "d'".
>I thought I had a half center move:(r2 u2)2 = (Fur,Bur)
but when repeated, I got(r2 u2)4 = (Fdr,Bur),
>so I realized that what I really had was the 6-cycle of centers:(r2 u2)2 = (Ful,Fdr,Bul,Bdl,Fur,Bur) (I think).
---- Stan -------