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

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發送短信 : Existence of solutions to MIMO relay feedback systems