發送短信 : Linear codes over F4R and their MacWilliams identity

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