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 / ____||  |  ___|| | \  / ||   / _ \\    ____    
/ //---`'  | ||__   |  \/  ||  | / \ ||  |    \\  
\ \\___    | ||__   | .  . ||  | \_/ ||  | [] ||  
 \_____||  |_____|| |_|\/|_||   \___//   |  __//  
  `----`   `-----`  `-`  `-`    `---`    |_|`-`   
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發送短信 : Block-sparsity-aware LMS algorithm for network echo cancellation