The bookend was on a shelf in what location?\nOptions:\n- bookshelf\n- pair\n- school cafeteria\n- library book\n- school library
Let's think carefully first. Step-by-step reasoning process:
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Shelf is a piece of furniture. School library is one of the places that have shelves. School library is one of the places where books are found. School library is a building or room. So the final answer is school library.
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