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

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Text this: Minimax phase error design of IIR digital filters with prescribed magnitude and phase responses