x - This indicates a locking join.This type of join is covered in the lessons if you are unfamiliar with this technique.
Edging would be attached to a piece of material by the middle picot on each set of outside chains. (Notice that these chain sets appear in pairs on either side of the small rings.
This pattern came out during some work for another "Viewer Request" for a more elaborate ivy pattern. While not as sophisticated as the what was desired, it works well as a simple edging that can be attached while making it.
Begin the pattern at the small ring marked "A" and make the 12 ds, p, 1ds, cl. Then follow with the chain, larger ring, another small ring, chain, etc.
Lena.501