Edges with the T-perm

The edge buffer is the top-right edge (letter B). The T-perm swaps this edge with the top-left edge (letter D), and touches no other edge.

Memo: look at the top sticker of the buffer. Its color tells you where it has to go: that’s your first letter. Go look at the sticker in that spot: that’s your second letter, and so on.

Solving: for each letter, a setup move brings that spot to D, without touching the buffer. Then the T-perm, then the setup in reverse. For example, for letter L: L’, T-perm, L. For letter A: l2 D’ L2, T-perm, L2 D l2.

If the buffer holds its own edge before the end, pick an unsolved edge and send it into the buffer: that’s a new cycle.

Remember: Setup moves only use L, D, l and d: they never touch the buffer, or the corners the T-perm swaps.

Troubleshooting

At the end, two edges are swapped

You probably forgot to undo a setup. Say it out loud before the T-perm, then after.

The buffer comes back too early

That’s the end of a cycle. Send an unsolved edge into the buffer and keep going.