In fact, in some cases the individual steps actually require an input of energy. And seven of these steps are actually at equilibrium or very close to being at equilibrium. And what that means is when a reaction e is at equilibrium, the gift free energy is equal to zero or very close to zero. But three of these steps, step one, step three and step ten are very exergonic steps. In fact, these are the three steps. So step one, step three and step ten, that essentially make up the majority of the free energy that is released in the process of glycolysis.