And in step number one, we basically want to carboxylate a Pyruvate molecule to form an oxalo acetate. Now, if we simply try to add a carbon dioxide onto the Pyruvate to form the oxyloacetate, that reaction in itself actually requires energy. It would be an endorganic process under cellular conditions. But what we do is we couple that process with the hydrolysis of ATP into ATP and pi orthophosphate. And because the hydrolysis of ATP is a highly exergonic process, we use that free energy to basically couple the endergonic process of carboxylating, that Pyruvate molecule. So together, this process, the coupling of these two processes, the hydrolysis of ATP and the carboxylation of Pyruvate, actually creates a relatively favorable process.