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ios - Get the data from all children in firebase using swift

I have a firebase realtime database. It looks like this:

image

Here is my code:

ref.child("2").observeSingleEvent(of: .value, with: { snapshot in

        guard let dict = snapshot.value as? [String:Any] else {
            print("Error")
            return
        }
        let latitude = dict["Latitude"] as Any
        let longtitude = dict["Longtitude"] as Any
        print(longtitude)
        print(latitude)
    })

My problem is that my code retrieves the data from only the child called 2. How can I make it retrieve the data from all the children?

If you have any questions just let me know. Thanks for any help!

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