What Is the Difference Between Olives and Mushrooms and Artichoke Hearts?

If you have one pizza, then you have one choice to make, which topping is it? All right, sorry, not one pizza. You have to choose both the first one ingredient, first topping and the second topping. So that gives you a product type. And this is ignoring some little details that we can get to in another episode. This is actually not obvious to a lot of people, and I want to be able to explain it to them.