In the previous lecture, we focused on step one of the citric acid cycle, and we saw that in step one, we basically take an acetyl group and attach it onto an oxalo acetate molecule to form a six carbon intermediate known as the citrate molecule. And so in this lecture, I'd like to focus on what happens next. So we're going to focus on steps two, three, and four of the citric acid cycle. And so so let's begin with step number two. Now, the entire point of step number two is basically to take the citrate molecule and to prepare it for oxidative decarboxylation that will take place in step three and step four of the citric acid cycle. So in these two steps, we're basically going to produce carbon dioxide molecules, and we're going to abstract those high energy electrons that we're going to use on the electron transport chain.