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Language/Type: VB parameters return

The following console program uses parameters and produces four lines of output. What are they?

Public Module ParameterMysteryExam4
    Public Sub Main()
        Dim x As Integer = 5
        Dim y As Integer = 1
        Dim z As Integer = 9
        Dim w As Integer = y + 2

        Surprise(x, y)
        x = Surprise(z, w)
        w += 1
        z = Surprise(w, x)
        Surprise(y, z)
    End Sub

    Public Function Surprise(y As Integer, x As Integer)
        x += 1
        Console.WriteLine(x & " " & y)
        y -= 1
        Return x
    End Function
End Module
line 1
line 2
line 3
line 4

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