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  ______     ___      _  __     ___     ______   
 /_____//   / _ \\   | |/ //   / _ \\  |      \\ 
 `____ `   | / \ ||  | ' //   / //\ \\ |  --  // 
 /___//    | \_/ ||  | . \\  |  ___  |||  --  \\ 
 `__ `      \___//   |_|\_\\ |_||  |_|||______// 
 /_//       `---`    `-` --` `-`   `-` `------`  
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發送短信 : OPTIMAL STOPPING AND THE PRICING OF AMERICAN OPTIONS