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This is how most children in grade school walk to school. In a straight line.
There is one public school for each district in the city and most of those districts are divided into a number of smaller sections. So in the morning, the children in those sections would gather in front of someones house or at a corner, then walk to school together.
I think this is a good idea because not only is there safety in numbers (not that this area is dangerous), but it's about the only time that children from different grades can be together.
With all the racket these kids were making while walking past, I'd say they were having a good time.