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  ______   _    _                ___      _  __  
 /_   _// | || | ||     ___     / _ \\   | |/ // 
   | ||   | || | ||    /   ||  / //\ \\  | ' //  
  _| ||   | \\_/ ||   | [] || |  ___  || | . \\  
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Text this: Resource allocation in multiuser OFDM based cognitive radio systems