Braiding eight cords into a flat braid

Step 10 8th under 7th, over 6th, under 5th, over 4th

Take the 8th cord and put it under the 7th, over the 6th, under the 5th and over the 4th.
Now the colors are blue, gray, black, black, black, black, blue, gray.
The whole thing is rather loosely braided at this point.