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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def handle(event):
 """Decorator for indicating that a given method handles an event. Note: while multiple instances of this decorator may be applied to a single method, it is not recommended. """

        def dec(func):
            if not hasattr(func, '_handle_events'):
                func._handle_events = set()
            func._handle_events.add(event)
            return func

        return dec