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