Joke: Go to town.

The "leader who entered the city gate" is a fool, unable to think, rigid, flexible, unable to assess the situation and improvise.

This "old father" is clever, a teacher by example, and humorous and generous.

This story illustrates three points:

1, some things, if not insoluble, are not so perfect.

Sometimes, seemingly unsolvable problems can actually be solved by divide and conquer, that is, turning big problems into small ones. The old father's method is uneven segmentation in today's language.

3. Although this is a joke, this joke tells people a truth: think flexibly and don't be one-sided.