Now, once we form the succinate, the next reaction, step six, or actually, I should generalize once we formed the succinate molecule, notice that we lost the carbon dioxide, two of them. And so we went from a six carbon molecule to a four carbon molecule. And now, in step six, seven, and eight, the entire point is truth, to transform this four carbon succinate into a four carbon oxalo acetate so that the citric acid cycle can basically begin all over again. So that's the goal in step six, seven, and eight. So step six is actually a hydration react or oxidation reaction. Oxidation reduction reaction.