What information does a document boundary separate?
Author a small source corpus and query. Compare chunk boundaries and record which qualifiers survive retrieval.
Split documents into overlapping word windows and rank lexical query overlap; inspect each top chunk with its source.
Cut these cards apart. Use the original example first, then let a partner supply a changed case. Keep sealed/final cards with the teacher until the learner commits a rule.
Document: Visitor guide
Text: Tours leave at nine. When rain is heavy, tours are cancelled.
My prediction and reason:
Document: Ticket guide
Text: Entry costs eight dollars. Children enter free on Sundays.
My prediction and reason:
Lexical retrieval is not semantic understanding and can separate a qualifier from a claim.