And the reason is because the fad is actually activated by attaching itself onto the enzyme. And because of that activity, because of being activated in that form, it actually does the opposite. In this case, it is used to actually give those electrons onto the NAD, as well as that h that carries those electrons to form the reduced nicotine mi adenine dinucleotide molecule that will be used by the electron transport chain to actually generate those ATP molecules. So, if we sum up all these three reactions, four reactions, I should say this is basically what we get. So, even though this net equation might seem simple, it actually consists of four different steps. In three steps, we form that acetocoenzyme A.