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SUBMIT YOUR IDEAHere is my solution:
@AYXAcademy As @Jean-Balteryx mentioned, value comes at header in task1 solution file, while it should be as per format in input json files.
For information, if you find two cities in task 3, it is because (see spoiler)
My solution.
To match with Task 1 solution data, used the 1st row as the column names.