In the event that a plurality of mobile devices use the same link identification codes, {HEAD ~ the immobile device} requests {TAIL ~ the mobile devices} to change the same link identification code to different ones among the mobile devices 
requests
In the event that a plurality of mobile devices use the same link identification codes , { HEAD ~ the immobile device } requests { TAIL ~ the mobile devices } to change the same link identification code to different ones among the mobile devices
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