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

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發送短信 : Soaring 21st century mathematics: Business math