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 /_   _//  |  ___||  | \| ||   / _ \\   | |/ // 
   | ||    | ||__    |  ' ||  / //\ \\  | ' //  
  _| ||    | ||__    | .  || |  ___  || | . \\  
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發送短信 : Adaptive-PCA: An event-based data aggregation using principal component analysis for WSNs