As trigrams were not quite working out, the next step was finding a better size for the n-grams that would be indexed. We've seen that bigrams are too broad, because their posting lists become unmanageably large, and that quadgrams are too specific, because we end up with too many keys in our index. Trigrams are a sweet spot between the two, but in practice, the ideal size is more like... 3.5-grams. Yet we can't split a character in two, can we?
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