{TAIL ~ IDP device} 138, in this instance, may represent a specialized security device that may be described as “higher end” in that IDP device 138 may cost {HEAD ~ more money} and provide a fuller set of security services 
{ TAIL ~ IDP device } 138 , in this instance , may represent a specialized security device that may be described as “ higher end ” in that IDP device 138 may cost { HEAD ~ more money } and provide a fuller set of security services
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