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

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Text this: On a Class of Constacyclic Codes of Length 4 p s over F p m [ u ] (u a)