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An analog computer actually carries out an analogy of a real physical process - - in this case , a mixed electrical-mechanical analogy . We note that on several occasions Havlin ruled out an appellation for a certain personality because it was more closely associated with some other personality ( see [ Hav ] ) . Completion is what Emacs does when it automatically fills out an abbreviation for a name into the entire name . If a customer or sales assistant wishes to demonstrate or try out an instrument in a shop then no licence would be required . Finally , the performers had a lively discussion of the points to take into consideration when working out an interpretation of a piece of this nature , playing short excerpts and taking numerous questions and comments from the audience .