And to see exactly why seven, let's take a look at the following diagram. So we begin with our activated version of palmitic acid, palmitoil coenzyme A, and we have 1234 all the way to 16 carbon atoms within that hydrocarbon chain. Now, after six cycles of beta oxidation, we basically release six acetyl coenzyme A molecules and we have a molecule left over that contains four carbon atoms. So we have the C, four keto acyl coenzyme A. Now, if this molecule undergoes one more beta oxidation, then we produce these two identical acetylcoenzine A molecules. And so that's why we need six plus one more.