We produce a single fadh two in step six and a single NADH in step eight. And we also use a water molecule in step number seven. Now, this step, this cycle takes place twice because we have two acetyl coenzyme A molecules coming from a single glucose. And that means the final product will be all these products multiplied by two. So the final product of the citric acid cycle, when one glucose produces the two acetyl coenzyme A molecules are four carbon dioxides. So one, two, that's two multiplied by two.