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The maker makes it and sells it. The buyer buys it but doesn't use it. The user uses it but never sees it.
He who makes it doesn't need it. He who buys it doesn't want it. And he who uses it doesn't know it. What is it?
When you cut me, you’ll get there faster, When I cut you, you’ll need a plaster. You say we are part of your eye, But speaking the truth, that’s a lie. What am I?