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

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發送短信 : Mathematics Embedded in Culture: The Weaves of Batak Basketry