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

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Text this: Cumulative sum control chart for monitoring process variance