I understand the diagram (and my diagram mirrors the diagram in class session #2) ... but at what point is it good practice to pull the trigger and draw frames? Since the "chunk" in this situation makes two (well, four, I suppose) situations, would frames be "worth it?"
When I drew out the frames, my second frame (which involved K/L in 4 and L/K in 6), I was able to fill all of the remaining lines in (MNP[K/L]O[L/K]).
-Justin