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