From:

~~~ ~~~ Subject:

I wrote:

? The key is that commutators are always odd permutations. So do the

? move that is an odd permutation of the edges, then use commutators.

But I *Meant*:

! The key observation is that commutators are always even

! permutations. So you to perform an odd permutation on edge, you

! should do the move that is an odd permutation of the edges, then use

! commutators.

Dan