this seven color comes in. There are seven colors of rainbow. There are seven heavens. There are all kinds of seven came into the picture. What is this three and seven then came from? I have only three color. Why do I have seven? Why do people say that there are seven colors in rainbow? In reality, if you go to the fundamental color there are only three. Now if you go to your computer really and if you have a base it a 24-bit machine you probably have about on the order of 8 million colors based on these three combination of RBG. So I can go from 3 to 8 million. And now if you just give you a color palette and I tell you that find it out what color is this, there is simply new you can find it out unless I tell you what those are. So what is my point yet? The point is that you can take three things and put it in different ways and you can get millions of millions of combinations. Same thing is true for this necessary and sufficient conditions. I can take three variables or three situations in a particular water conflict and arrange it in different ways. I can get many, many combinations. So in this particular from three to seven to millions, that is the case. That means my necessary and sufficient conditions will never be able to be exhaustive. I cannot do it. Although fundamentally they are related maybe to only three. But I cannot come to that three level. If I come to that three level is too abstract. So that's why I put this basically mumbo-jumbo stuff here. That basically you have only 26 letters