Hi @spikeyxxx and @dostovel, Thank you. I think I got it now. Since all the visuals in the lesson, the images as well as the demo file are all about face loops and faces flow pattern. I some how see the faces only (ie your attached left image have two columns of faces to 4 columns and right image have three columns to five columns). It never occurred to me that it was counted this way. (Note: because of my perception on faces flow, the left image was interpreted as 3 edges to 5 edges!😕).
