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The search engine allows queries to be formed from
arbitrary Boolean expressions containing the keywords AND and OR,
and grouped with parentheses. For example:
- information "retrieval science"
- finds documents containing both 'information' and
'retrieval science'
- information and retrieval
- same as above
- information or retrieval
- finds documents containing 'information' OR
'retrieval science'
- web*
- finds documents containing words starting with 'web'
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