请哪里有英文单词单复数转换的代码？
比如能完成以下单词间的转换：
User <-> Users
Category <-> Categories
Person <-> People (当然这个就不一定非得通过了)
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found it from Google Code Search
User <-> Users
Category <-> Categories
Person <-> People (当然这个就不一定非得通过了)
________________________
found it from Google Code Search
