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swift - How do I perform a pagination query on Firebase's iOS SDK?

Firebase Model

This is my model.

messagesRef = Firebase(url: "https://"+CONSTANTS.FirebaseDB+".firebaseio.com/messages/1:1000")
    messagesRef.queryLimitedToLast(5).observeEventType(FEventType.ChildAdded, withBlock: { (snapshot) in
        self.message_list.append(snapshot) // it works.
    });
});

My code works -- it gets the last 5 messages (8-12).

However, what if I have a function query the next 5 messages (2-6)? With a start and offset. How can I query this?

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