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My mother owns a used bookstore and there is an old man that comes in weekly to exchange books, on at least 3 occasions he has brought in books and then went and picked up another copy of the same book he just brought in. He got angry at the clerk one time because he thought she had given back the same books, but he had picked up another copy of both of the same books he had just exchanged. They now have a list of all the books he had bought and exchanged.
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