Date: 10 DEC 1980 0157-EST From: DCP at MIT-MC (David C. Plummer) Subject: The 28 QTW all-edge-flipper mentioned by ALAN To: CUBE-LOVERS at MIT-MC Indeed it can be done in 28. Tool: flip the top edges and the bottom edges: (R L) (U D) (F B) (R L) (U D) (F B) /\ || To do the other four, insert the following things at the indicated place (u b') (u' D b' u' d l' u' d f' u' d r') (b u') There may be another place to put this to find a shorter path. Those with time are free to try and find one.