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Lateral Thinking #22- Circular Reasoning -

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Puzzle Image
Manhole covers for sewer drains are typically circular in shape (the ones that are removable anyway). This shape has an important advantage over a square or rectangular shape. Can you figure out what that is?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?