Every system the best and a very good definition because it's kind of vague and you can't quantify with that definition. You can't use numbers. So let's explore the concept of entropy using public probability, and maybe we can come up with a better definition using probability. Okay, so let's look at this system here. This system is composed of two containers connected by a bridge, and within the container, there are four different molecules. And these molecules are allowed to diffuse from one side to the other side.