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

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發送短信 : Maximum coverage of radius-one sources in the wireless communication