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We can, in fact, do something quite close to that: this design proposes using trigrams as the key for the inverted index, and augmenting the posting lists with extra information about the "fourth character" that would follow the trigram in that specific document. To do that, we could simply store that fourth character as an extra byte, but that turns our index into a quadgram index, and we've seen those are just too large to store. What we store instead is a bloom filter that contains all the characters that follow that specific trigram.
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.uri("https://mock.api.com/express?expressNo=" + expressNo)
return err(f"username too short: {name.len()} chars (minimum 3)");
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