. You can register to
            observe <code>AWSPersistenceDynamoDBObjectDeletedNotification</code> by calling the
            following method: </p>
<table class="sample"><tr><td align="left"
                    ><pre>[[NSNotificationCenter defaultCenter] addObserver:self
	selector:@selector(mergeDeletedObject:)
	name:AWSPersistenceDynamoDBObjectDeletedNotification
	object:nil];</pre>
                </td></tr>
    </table>
    <p>When you receive the notification, you should remove any invali