And so we take this crotinil molecule and we reduce it to basically remove this double bond and basically form this single bond. And so we see ultimately, when we go from step five to step seven, what we do is we are more specifically when we go from yeah, we can say from step five to step seven, we transform this beta keto group to a methylene group. That's the point of step five through step seven. Why do we do that? Well, because the fatty acid that we generate at the end only contains single bonds. So we want to form a saturated fatty acid molecule.