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

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