ocr: Ina addition to "all and' "any", some search engines offer a third option: "not". When youi type in a word - and mark itas "not", - the search engine will ignore any document that ncludes that word. The - "Not" condition is always usedi together - with "all" or"any". Use this option very carefully, since it can eliminate usefuldocuments from the listofsites.
