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Who knows the joke about the seven-dollar bill?

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It's counterfeit money. I want to print 2 yuan's paper money, but when I print it, I find it's 3 yuan. . But the story didn't end sadly. .

He decided to go downstairs to the blind man's grocery store to spend 3 yuan's money every day after dark, and then he found that he got 7 yuan's money back.

Hee hee is a little boring.