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抽屉原理指的是:把多于n个的物体分放到n个抽屉中,必有一个抽屉中放有2个或2个以上的物体。运用这个原理,可以解决一些证明题。
Drawer principle refers to: put more than n objects into n drawer, there must be a drawer to place two or more than two objects. Use this principle, you can solve some of the proof questions.