Let me write that down. Theoretical, theoretical probability. Well, maybe the simplest example, or one of the simplest examples, is if you're flipping a coin. And let's say in theory you're flipping a completely fair coin and you're flipping it in a way that is completely fair. Well, there you know you have two outcomes. The coin will either result, either heads will be on top or head tails will be on top. And so theoretically you say, well look, if I want to figure out the probability of getting a heads, in theory I have two equally likely possibilities and heads is one of those two equally likely possibilities.