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 __   __     ___                _____    __   __  
 \ \\/ //   / _ \\    ____     |  ___||  \ \\/ // 
  \   //   / //\ \\  |    \\   | ||__     \   //  
  / . \\  |  ___  || | [] ||   | ||__     / . \\  
 /_//\_\\ |_||  |_|| |  __//   |_____||  /_//\_\\ 
 `-`  --` `-`   `-`  |_|`-`    `-----`   `-`  --` 
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發送短信 : Computer simulation of closed-loop control system