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The text search engine allows queries to be formed from arbitrary Boolean
expressions containing the keywords AND, OR, and NOT, and grouped with
parentheses. For example:
finds documents containing 'information' or 'retrieval'
information or retrieval
same as above
information and retrieval
finds documents containing both 'information' and 'retrieval'
information not retrieval
finds documents containing 'information' but not 'retrieval'
(information not retrieval) and WAIS
finds documents containing 'WAIS', plus 'information' but not
finds documents containing words starting with 'web'
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