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Description How far can you make a stack of cards overhang a table? If you have one card, you can create a maximum overhang of half a card length. (We 阅读全文
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You are standing in the supermarket in front of the freezers. You have a very tough task ahead of you: you have to choose what type of ice cream you w 阅读全文
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Most airports have multiple runways. To identify runways, they are given a number indicat- ing the direction of the runway. Such a runway number is ob 阅读全文