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The prefix is just a shorter hash. It specifies a set of urls. The urls that have a hash which begins with that prefix.


> The prefix is just a shorter hash

With all due respect, this makes no sense whatsoever. You can't make any meaningful conclusion (in isolation, or even with small enough/random enough datasets) about the content that was hashed from only a part of the resultant hash, that's the whole point of how hashing works.




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