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December 06, 2007



Simple. It thinks (based on user input and click-through) that a relatively rare word "powerset" could be misspelling of something else. So its intelligent spell correction throws in alternatives into the query right after initial parsing, and index serve code pulls out the pages that contain these alternatives (along with the pages that contain "powerset") and ranker ranks them pretty high, because powerset isn't very well known outside NLP/IR circles.

Quoting "powerset" excludes it from implicit spell correction thereby forcing an exact index match.


"why do I get adverts for 'Find Landrover Parts?"
Because, prosaically, the Discovery is a common Landrover model, and there will be many owners looking for replacement engines.

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