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The Problem
Amir borrowed a book from the school library. It was due on Friday. On Thursday night, he went to put it in his backpack. But it was gone! He looked on his desk. Not there. Under his bed. Not there. In the living room. Not there. 'I need to find it by tomorrow or I'll have to pay for it!' Amir said. He decided to retrace his steps and think about everywhere the book had been.