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. We go from a six carbon molecule to a five carbon molecule known as alpha keto gluterate. Now, once we form the alpha ketoglutrate, that further undergoes a decarboxylation reaction. So we release yet another carbon dioxide.