 Okay, I want to demonstrate to you what I meant or what I mean by the the botmus horse on your cup later. So let's say we have the same question that we have. No, it was 40 minus 52 plus 20. And when I press equal, you will see the answer is eight. Because in the memory, if we go back to the steps, you will see what I mean. The memory, the calculator knows that when you press, this number will always constantly change. But the minute it evaluates the signs, both signs. The minute it will evaluate the signs, which is the minus and the plus, that will change. So let's go back. I'm going to cancel 40 minus 52. You see there, it writes 52. Look at when I write plus, because I have 40 minus 52, the calculator says it's minus 12. When I add plus 20, and I press equal, it will evaluate it this way because it works from left to right. I'm going to do the very same thing. But now look at this. When I use multiplication, 40 minus 52. When I press multiply, as you can see, it didn't evaluate that function because it knows the priorities that multiplication comes before addition and subtraction. So multiplication comes before addition and subtraction. And when I say 20 equal, and that will give you the answer. And that's how you use the calculator. In memory of a calculator, how they program the calculator knows the book must rule. So you don't have to go and start changing and doing things. The calculator knows them. The other thing, this is the only exception. The only exception is if there was a bracket. So 40 minus open bracket, and I put the 52 plus. You can see that because of that bracket, it cannot evaluate the minus and the plus. It's going to wait for me to put the last number. You can press the close bracket or not. If you look at it, at this point, it only evaluates what is inside the bracket. Because you can see the answer there is 72. When I press equal side, the answer becomes 32. This is the rules or the laws of basic operations. When you have minus or subtraction and addition, you work from left to right. Unless there are brackets, then we evaluate what is inside the bracket. Thank you.