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 / ____||  /_   _// \ \\ / // | || | ||  /_____// 
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 \_____||  /_____//    \//     \____//   `__ `    
  `----`   `-----`      `       `---`    /_//     
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發送短信 : Influence of social relations on human mobility and sociality: a study of social ties in a cellular network