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 {TAIL ~ a keypad} , a touch display, a joystick or other input device 
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 { TAIL ~ a keypad } , a touch display , 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 TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH