Wow - I botched this up! Thought I would make it easy. Right. What I mean is that this join is good to attach completely separate parts of a design. It is not useful for the picots between rings because there is usually no need for the double picot, which might just look bulky. Maybe there would be a use in some design, but I'll wager not as often as the first use. Am I clear? Oh, to communicate!
Ahem - that would be "edging".... : ))