So let's begin by examining transferase and what it actually does. So suppose we have the following glycogen molecules. So it's a simple molecule with a single alpha one six glycocitic bond. So these bonds here are the alpha one four glycocitic bonds and this bond here is the alpha one six glycocitic bond. Now remember what I said about glycogen phosphorase. It can only cleave alpha one four glycocitic bonds and it stops cleaving the alpha one four glycocitic bonds when it gets to four residues away from the nearest branching point.