發送短信 : ON HADAMARD MATRICES AND RELATED CODES

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