Now, let's say we go from a mono unsaturated to a polyunsaturated in which we have two of these double bonds. How do we incorporate that into our name? Well, we basically keep the A. And after the A, we add the die component. So we have hexadeca dinoic acid, 16 to 216 carbons, and two double bonds. Now, if we increase the number of double bonds by one, so we have three double bonds, we have this polyunsaturated molecule.