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执行下列程序,单击命令按钮在窗体上输出结果为______。 Option Base 1 Private Sub Command1_Click() Dim a(3, 3) As Integer, k As Integer Dim i As Integer, j As Integer, n As Integer n = UBound(a, 1) For i = 1 To n - 2 For j = i To n - i a(i, j) = k + 4 a(j, n +1 - i) = k + 3 a(n + 1- i, n + 1 - j) = k + 2 a(n + 1 - j, i) = k + 1 k = k + 4 Next j Next i If n Mod 2 <> 0 Then a((n + 1) / 2, (n + 1) / 2) = k + 1 End If Print a(1, 2); a(2, 3); a(3, 3) End Sub