The pigeonhole principle is a powerful tool used in combinatorial math. But the idea is simple and can be explained by the following peculiar problem.
鸽子洞原理是分析数学组合的有力工具。但是其概念简单，可以通过以下具体的问题加以阐述。
The pigeonhole principle is a powerful tool used in combinatorial math. But the idea is simple and can be explained by the following peculiar problem.
鸽子洞原理是分析数学组合的有力工具。但是其概念简单，可以通过以下具体的问题加以阐述。
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