code that will have the same efficiency as your other uniquely decodable code which will be more troublesome to decode so we're going to strict attention to prefix codes all right so what's under the hood here let me give you a quick brief sketch one direction for any prefix codes d and that's kind of a subset of what's on previous slide for our prefix codes C we have down this is satisfied that's what I stated what's the sketch order all the lengths of your code words then setup we prefix code right so we have all these