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Typing any of these:Finds:
NOT not !documents that do not contain the condition or word following NOT
AND and &documents that contain both the conditions or words separated by AND
OR or |documents that contain either of the conditions or words separated by OR
ACCRUE accrue , (comma)the same documents as OR, but increases the relevance ranking of a document when the document contains more than one matching conditon or word
@documents which contain both of the words that are separated by @, as long as the words are next to each other in the documents. (Do not place spaces between @ and either word.)

Examples:
Typing this text:Finds documents that contain:
heroin & drugs & newsall three of these words
heroin | drugs | newsat least one of these words
heroin, drugs, newsat least one of these words. Notes gives higher relevance to documents that contain two or three of these words
drugs@newsdrugs and news next to each other
(drugs AND heroin) OR newsdrugs and heroin; news
drugs AND (heroin OR news)drugs and heroin; drugs and news
drugs AND NOT (heroin OR news)drugs, as long as they don't also contain heroin or news
  
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