对窗体编写如下事件过程: Private Sub Form. _ MouseDown(BuRon As Integer,Shift As Integer, X As Single, Y As Single) If Button=2 Then Print 'AAAAA' End If End Sub Private Sub Form_MouseUp(Button As Integer,Shift As Integer,X As Single, Y As Single) Print 'BBBBB' End Sub 程序运行后,如果单击鼠标右键,则输出结果为 ______。