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High and low lists
For each term, we maintain two postings lists called high and low
Think of high as the champion list
When traversing postings on a query, only traverse high lists first
If we get more than K docs, select the top K and stop
Else proceed to get docs from the low lists
Can be used even for simple cosine scores, without global quality g(d)
A means for segmenting index into two tiers
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