Retrieval overlap went up 13 points by promoting sentences to paragraphs

Automated excerpt

The whole trick fits in one sentence: retrieve at sentence level, then hand back the paragraph each hit came from. Fifteen contracts from the CUAD dataset, 242 questions with the correct answer spans marked by hand. So containment is arithmetic: sentence [s_start, s_end) sits inside paragraph [p_start, p_end) when p_start <= s_start and s_end <= p_end.

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