The question asked by Huang Cong was a very practical one.

If we think that building a city is a big task, we have to know how many small tasks there are in this task, so that it is possible to divide everyone into different groups to complete.

They know very well that they don't really move rocks or anything.

What they had to do was to break down the building of the city into several small tasks and complete them one by one.

Something like that

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