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

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發送短信 : FIR filter design