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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