Part of green chemistry focuses on atom economy, which is a measure of atoms found in the desired product from the given reactants.

Part of green chemistry focuses on atom economy, which is a measure of atoms found in the desired product from the given reactants. For example, if there were a total of eight atoms found in the reactant molecules, and the resultant desired product of that reaction contained seven of those atoms (one being lost as by-product), then this reaction would be classified as having good atom economy. in other words, there was little "waste" of atoms found in the product. Given this information, how efficient is the atom economy found between steps 4 and 5 in glycolysis?