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Graphics Interchange Format  |  1997-01-13  |  54.9 KB  |  409x338  |  4-bit (16 colors)
   ocr: ooservers Subect Observer Atacho Podatet) Detacho Notyo Foraloin.observers omupdated: subject ConcreteSubject ConcreteObserver subjectslales ooserverstate GetStatoo Updatel eumsubiectstale observerstate subject GetStatel Figure 2: Basic siructure of tbe Obserrer pattern.