On Sat, 23 Apr 2005 21:30:31 -0700, "foot2foot"
wrote:

Crossover is extension at the moment of edge change.

Crossunder is retraction/flexion at the moment of edge change.


So is it then fair to say that one must be either crossed over OR
crossed under in order to turn?

bw
(PS- the brevity of your post was admirable.)