A 9-strand braid in the Fill-the-Gap family

I saw this 9-strand straw braid on Facebook ( https://www.facebook.com/reel/1282550473504103 ) and immediately saw how easy it would be to translate to other things besides straw.

It's in the fill-the-gap braid family, where a simple, repetitive, easy-to-memorize pattern leads to a lovely braid.

And indeed it did.

I took a piece of cardboard (square because I'm lazy, though round or other shapes are fine), put a hole in the middle, and cut 16 slots around the edge (4 per side on my square piece of cardboard).  This disk doesn't have to be perfect -- it's only to hold the yarn under light tension.  I did 16 slots so I'd have a blank slot between groups of yarn as I rotated around the disk.

Obviously one doesn't need any kind of disk -- it can be done in the hand, or on a marudai, or by means of whatever other aids you find useful.

Take 9 strands of yarn (or thread or straw or whatever).  Since I'm using yarn, I knotted the end and pushed it down through the hole.  Then I  put two strands per side (each in two adjacent slots).  I put the last piece on one of the sides, next to the two strands that are already there.

Take the outermost strand on the side with 3 strands and jump it over to the other side of the adjacent set of 2 strands.  Repeat.

Here's a rough diagram.  You can see how there are 3 groups of two strands and 1 group of 3 strands.  The strand that is marked in blue jumps over to the other side of the adjacent group of two (the intended destination is shown as a dashed blue line).  Rotate (or not) the disk and continue doing the same thing.

You can go either clockwise or counterclockwise as long as you are consistent with the traveling strand going over four other strands.  Dunno how easy it would be to reverse direction but it's probably not impossible.

I'm sure this generalizes to a lot of other set-ups, too -- quite possibly any multiple of X while using that multiple plus one.  The fill-the-gap works on the opposite principle -- a multiple of X while using that multiple minus one.  There are many other possibilities, of course.  I might have to do some playing around...

I may post a photo of the completed braid, especially if I also do a few more experiments either with different colors or with different braiding patterns.  Or not, because there are other things ping-ponging around in my brain at the moment and one of those might emerge first.