So let's call these two steps stage one. Now let's move on to stage two, which basically involves step three, step four and step five. In these steps, as we'll see in just a moment, we have the decarboxylation reactions taking place, and we also form the only molecule that has the high energy phosphate group, our GTP, in this stage. So let's begin with step three. So in step three, once we form our six carbon isocytes or citrate, that undergoes a decarboxylation reaction, that means we release our carbon dioxide in step three, and we also use our NAD plus and we reduce it into the NADH, and we also form an H plus ion. Now, we also form because we lose a single carbon that leaves as the carbon dioxide.