LinkedListNote and 70-536 Exam

Can anyone help to explain to me how the heck this little program returns "E, B, D, A, C"?

My real problem is that I'm not getting how the LinkedListNode thing works. I understand LinkedList.AddFirst and LinkedList.AddLast...etc. But when it comes to the LinkedListNode = LinkList.AddBefore(LinkedListNode, item) I get really lost. How does this work?

The MSDN explanation sort of confuses me more.
http://msdn.microsoft.com/en-us/library/ahf4c754.aspx

Module Module1
    Sub Main()
 
        Dim v1 As String
        Dim v2 As String
        Dim v3 As String
        Dim v4 As String
        Dim v5 As String
 
        v1 = "A"
        v2 = "B"
        v3 = "C"
        v4 = "D"
        v5 = "E"
 
        Dim vList As New LinkedList(Of String)
        Dim vNode As LinkedListNode(Of String)
        vNode = vList.AddFirst(v2)          ' b - makes sense
        vList.AddFirst(v5)                  ' e, b - makes sense
        vList.AddLast(v3)                   ' e, b, c - makes sense
        vNode = vList.AddAfter(vNode, v1)   ' e, b, a, c - makes sense
        vNode = vList.AddBefore(vNode, v4)  ' ??????????? - not a clue
 
        For Each v As String In vList
            Console.WriteLine("{0}", v)
        Next
 
    End Sub
End Module

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