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

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發送短信 : Formation tracking of mobile robots under obstacles using only an active RGB-D camera