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           _    _    __   __   _    _     _  __  
    ___   | || | ||  \ \\/ // | || | ||  | |/ // 
   /   || | || | ||   \   //  | || | ||  | ' //  
  | [] || | \\_/ ||   / . \\  | \\_/ ||  | . \\  
   \__ ||  \____//   /_//\_\\  \____//   |_|\_\\ 
    -|_||   `---`    `-`  --`   `---`    `-` --` 
     `-`

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發送短信 : Differencing labeled transition systems