{TAIL ~ The user input interface}, in turn, can comprise any of a number of devices allowing the entity to receive data from {HEAD ~ a user}, such as a keypad , a touch display, a joystick or other input device 
{ TAIL ~ The user input interface } , in turn , can comprise any of a number of devices allowing the entity to receive data from { HEAD ~ a user } , such as a keypad , a touch display , a joystick or other input device
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH