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

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發送短信 : Duration, convexity and time as components of bond returns.