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                                    X0                                                                                
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                                   啟動    



                     M10          M20
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                                       啟動      I                                                                             啟動                                                              
                                                    I                                                                          
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                     M10           M20      I
------------------I / I------------I  I------'  
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                            是已驗證過的程序，寫出來，與大家共享。

不都是這種套路嗎