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A comment on Why googling “2 * -2” does not show any results?.

Re:Why googling “2 * -2” does not show any results? by mbrubeck on Friday July 06, 2018 @02:19PM (#17473838)
Maybe because "-foo" means "search for documents that do not contain foo", so queries like "foo -foo" never match anything:

https://www.google.com/search?q=foo+-foo

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