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Language/Type: VB parameters

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

Public Module ParameterMystery1
    Public Sub Main()
        Dim x As Integer = 9
        Dim y As Integer = 2
        Dim z As Integer = 5

        Mystery(z, y, x)
        Mystery(y, x, z)
    End Sub

    Public Sub Mystery(x As Integer, z As Integer, y As Integer)
        Console.WriteLine(z & ", " & (y - x))
    End Sub
End Module
line 1
line 2

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