And notice we begin with two of them. So we have two of these intermediates and we form two of these zelulose phyphosphate products. Now, one of these xyulose molecules is used in step two and the other one is used in step four, as we'll see in just a moment. So let's move on to step number or process two of the pentose phosphate pathway, specifically the non oxidative phase of this pathway. So we take one of these cellulose phyphosphate molecules and we take another ribose phyphosphate molecule. So so far we actually used three ribose phyphosphate.