There are 27 words or “pigeons” that can start with one of the 26 different English letters or “pigeonholes. ” By the pigeonhole principle, two of the words must start with the same letter.
假如27个单词能以26个不同的英文字母中的一个开头（类同于将27个”鸽子“”放入26个鸽子洞中），根据鸽子洞原理，必有2个单词以同一字母为首。
Two words: four letters and five letters.
两个词：一个是四个字母，一个是五个字母。
If two words are anagrams, they contain the same letters with the same counts, so their Counters are equivalent.
如果两个单词是换位词，他们包含同样个数的同样字母，所以他们的计数器是相等的。
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