@_mathioudi it's pretty much the same as a normal alpha, except when you change colours you bring the thread in front of the bracelet, instead of behind.
@aayuraje cut a base string so long, that you can fold it in half + a little extra string. When folded, you will have 2 base strings for the pattern itself and the loop is the litte extra string. So you will leave the loop stand out and then knot normally the pattern. (I know, so bad explained, but I hope you get a imagination about what I'm talking about...)