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                                    X0                                                                                
-------------------------------I  I-----------------------------------------------------------------[  PLS    M10   ]
                                   啟動    



                     M10          M20
------------------I  I-----------I / I-------.-------------------------------------------------------------(   M20  )
                                       啟動      I                                                                             啟動                                                              
                                                    I                                                                          
                                                    I
                                                    I
                                                    I
                     M10           M20      I
------------------I / I------------I  I------'  
                                       啟動                                                          

                            是已驗證過的程序，寫出來，與大家共享。

10年前就用過這種方法啦