And this is not the same structure that we begin with here. Notice that in step three, we don't actually regenerate the lipo amide that we used in step two. Unlike in this case, where in step one we used TPP and we regenerated TPP here, we began with lipoamide and we ended up with dying hydro lipoamide. So even though in step three we actually formed the acetyl coenzyme a structure, we essentially are able to transfer that to carbon acetyl group from the pyruvate and onto that carrier coenzyme a molecule. We did not regenerate the lipoamide. And that's where the final enzyme comes into play.