4. He felt he was docked points as he had to traverse multiple dictionaries to navigate the JSON output which was inefficient. The employer suggested a 'Tree structure' might have been better.

5. He felt he scored points by describing why Python sets are more efficient than dictionaries (for some use case).

@andyc It would be interesting to know why they thought traversing multiple dictionaries wasn't using a tree structure.

@rclayton Yes. My Python knowledge isn't that good. My son knows more than me but researching it - I couldn 't quite see what the problem was. But I wasn't there.

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