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I'm sure you've thought about every single possible situation to conclude your insightful comment.

Otherwise...

There is no use for your comment.

Re-read their comment.

If they didn't notice the duplication, there is no use in removing it?

But this tool would have helped them spot it in the first place.

But for what purpose, then?

I think they were just making a sarcastic point - i.e. the tool has lots of uses!