{TAIL ~ User interface} 520 may include mechanisms for inputting information to user device 210 and for outputting {HEAD ~ information} from user device 210 
{ TAIL ~ User interface } 520 may include mechanisms for inputting information to user device 210 and for outputting { HEAD ~ information } from user device 210
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH