In the previous chapter, it's just how many people are in the shops. The difference i see is that in this situation, you could have an infinite amount of bicycles in your bicycle shop. So there's is that the difference tat i suppose that is the difference between these two problems. And it's not always easy to say exactly what you should use one or the other. But thers theast pairs of chapters that kind of reflect that you now the sides of the problem for want e better wr ber, interesting.