They're used to actually reduce the molecule, as we'll see in just a moment. And that allows us to form this intermediate. And now we can couple this intermediate with coenzyme A to form this acetyl coenzyme A complex. And in the final step, we generate the NADH and we regenerate a coenzyme, the lipopemi, that we mentioned just a moment ago. So let's see exactly what that means. Let's begin with step number one.