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 _____      _____    ______      ___      ______  
|  __ \\   |  ___|| |      \\   / _ \\   /_   _// 
| |  \ ||  | ||__   |  --  //  | / \ ||    | ||   
| |__/ ||  | ||__   |  --  \\  | \_/ ||   _| ||   
|_____//   |_____|| |______//   \___//   /__//    
 -----`    `-----`  `------`    `---`    `--`

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Text this: Post-buckling loads of a horizontal pipe string with variable length