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    ___    /_   _// | || | ||  /_   _//  / ____|| 
   /   ||   -| ||-  | '--' ||   -| ||-  / //---`' 
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   \__ ||  /_____// |_|| |_||  /_____//  \_____|| 
    -|_||  `-----`  `-`  `-`   `-----`    `----`  
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發送短信 : SAUCeR: A QoS-aware slotted-aloha UWB MAC with cooperative retransmissions