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  _____    _    _    _    _     ______    ______  
 |__  //  | || | || | \  / ||  /_   _//  /_   _// 
   / //   | || | || |  \/  ||   -| ||-     | ||   
  / //__  | \\_/ || | .  . ||   _| ||_    _| ||   
 /_____||  \____//  |_|\/|_||  /_____//  /__//    
 `-----`    `---`   `-`  `-`   `-----`   `--`

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發送短信 : Interactive formula for fire resistance of columns