The maker has no need for it, the buyer doesn't use it, and the user can't see it. What is it?
English
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Coffin
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A glass ball
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It's a coffin
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A stick for a blind man
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Never thought of that lol answer was coffin but that can work too
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[spoiler]Coffin[/spoiler]
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Coffin?
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What about vampires? They are users and they can see it