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Of the books standing in a row on a shelf, an atlas is the 30th book from the left and the 33rd book from the right. If 2 books to the left of the atlas and 4 books to the right of the atlas are removed from the shelf, how many books will be left on the shelf?
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书的总量是30+33-atlas这本书=62，一共拿到了2+4=6本书，62-6=56
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