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@DavidLublin like the joke about the guy who attends a lecture, and the mathmetics prof says a number, and everyone laughs. he asks what's so funny - they say, oh, the prof always tells the same jokes, so as a shorthand we just refer to them by number.
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@DavidLublin the guy yells out a different number - everyone laughs even harder. he asks why they laughed more at his joke than at the profs joke - "oh, we haven't heard that one before"