class Solution:
    def checkDuplicateDeliveryIDs(self, deliveryIDs, timeWindow):
      
        last_seen = {}
        
        for i, deliveryID in enumerate(deliveryIDs):
            if deliveryID in last_seen and i - last_seen[deliveryID] <= timeWindow:
                return True
            last_seen[deliveryID] = i
        
        return False

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