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  _____     _____     _____      ___     _____    
 / ____||  |  ___||  |__  //    / _ \\  |  __ \\  
/ //---`'  | ||__      / //    / //\ \\ | |  \ || 
\ \\___    | ||__     / //__  |  ___  ||| |__/ || 
 \_____||  |_____||  /_____|| |_||  |_|||_____//  
  `----`   `-----`   `-----`  `-`   `-`  -----`

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發送短信 : Exact solution for buckling of columns including self-weight