OR Search: Boolean OR; match any document that meets ANY selection, for example, "(author is fred OR barney) OR (practice is backup OR database)".
AND Search: Boolean AND; match documents that meet EVERY selection; for example, "(author is fred AND barney) AND (practice is backup AND database)".
Joint Search: Match documents that meet EVERY category, but use OR within a category; for example, "(author is fred OR barney) AND (practice is backup OR database)".
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