So, stage number one is the preparation step. We create that molecule that is capable of undergoing the two decarboxylation reactions. In stage two, we basically have the two decarboxylation reactions, and we also have the only reaction that produces the high phosphoryl transfer potential molecule, the GTP. Now, we also use the phosphate to form that GTP, and we basically released the coenzyme A that went into the reaction in step number four. Now, stage number three are basically steps six, seven and eight. And the entire purpose of these steps is to basically regenerate our molecule, the oxalo acetate, the four carbon molecules that we'll need to use again to basically undergo the reaction.