God placed two flocks of sheep on the grassland, one in the east and one in the west. God also assigned two kinds of natural enemies to the sheep: lions and wolves. God said to the sheep, ``If you want wolves, you get one, which can bite you at will. If you want lions, you get two, and you can choose one of the two lions at any time and also switch between them whenever you want.''

(So, would you choose a wolf or a lion?)

The eastern flock thought: lions are much fiercer than wolves, so it’s better to have a wolf. So they asked for one wolf. The western flock thought: although lions are fiercer than wolves, we have the choice right, so we want lions. So they asked for two lions.

After the wolf entered the eastern flock, it started eating sheep. The wolf was small and had a small appetite, one sheep could feed it for several days. Thus, the sheep were hunted only once every few days.

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