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

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Text this: Openings in thin-walled steel structures