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

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Text this: Henrici's transformation and its application to the computation of derivatives of eigensystems