The productions for vowel, caps, and threeletter are not necessarily distinct; they can all grab an overlapping set of words. For example
caps和threeletter的结果不需要是确切的；它们全部都可以获取彼此有重叠的单词集合。
The productions for vowel, caps, and threeletter are not necessarily distinct; they can all grab an overlapping set of words. For example
caps和threeletter的结果不需要是确切的；它们全部都可以获取彼此有重叠的单词集合。
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