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A1: User has sufficient knowledge for initial query.
A2: Relevance prototypes are “well-behaved”.
Term distribution in relevant documents will be similar
Term distribution in non-relevant documents will be different from those in relevant documents
Either: All relevant documents are tightly clustered around a single prototype.
Or: There are different prototypes, but they have significant vocabulary overlap.
Similarities between relevant and irrelevant documents are small
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