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subject.state = 1 # Output: # ConcreteObserverA: Reacted to the event # ConcreteObserverB: Reacted to the event subject.state = 2 # Output: # ConcreteObserverB: Reacted to the event subject.detach(observer_a) subject.state = 3 # Output: # ConcreteObserverB: Reacted to the event In this example, we