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A girl once got straight A+ grades and was given a gift by her teacher. "This is a special gift. If you're thirsty, it can quench your thirst. If you're hungry, it can still be beneficial. If you're cold, burn it and feel the warmth." What was the gift?
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?
The maker makes it and sells it. The buyer buys it but doesn't use it. The user uses it but never sees it.