think the coding looks at your data as a stream you go literally through it ans doesn't including that acts more like a stack and putting things popping things from stack is the way things get encoded and that matches much better with the ideas we're going to step through here and next is actually possibly practical in fact the NS used in many place but physically here very well matched with BAE type coding schemes then in our work Berkeley Jonathan let a lot of this work today with Freesat kima and myself we