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    ___    |  ___||  |__  //    / _ \\   | |/ // 
   /   ||  | ||__      / //    | / \ ||  | ' //  
  | [] ||  | ||__     / //__   | \_/ ||  | . \\  
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    -|_||  `-----`   `-----`    `---`    `-` --` 
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發送短信 : PERPETUAL AMERICAN OPTION PRICING UNDER SINGLE REGIME CHANGE