Submitted by Brianprokpo456 t3_zx7osk in explainlikeimfive
pauliebb t1_j1yu6px wrote
Imagine a city has many pathways in and out... Leading to different cities for trading or entertainment etc.
Now imagine all these pathways are closed, you can choose to open them for access into or out of the city.
But the more you open the more likely the city is going to be attacked by something you wouldn't want in your city.
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