范围生成器计算给定字符串的hash码，以搜索并返回一个点范围，这个范围的起始值和终止值是hash码本身。
The range producer computes the hash code for the given string to search for and returns a point range where the start and the end of the range is the hash code itself.
范围生成器计算给定字符串的hash码，以搜索并返回一个点范围，这个范围的起始值和终止值是hash码本身。
The range producer computes the hash code for the given string to search for and returns a point range where the start and the end of the range is the hash code itself.
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