What is the purpose for the weird knots along the black strings that are not the same as the others? Why do the black strings zig zag and have fb/bf knots thrown in? I originally thought it was to keep each of the black strings even in length, but as I kept going on the bracelet I realized that some black strings getting really short while others were very long. As I was finishing the last few lines I abandoned the pattern and used the longer strings up ๐คท๐ปโโ๏ธ