The user interface 136 may include a display component, such as {HEAD ~ a digital or analog display device} designed to provide {TAIL ~ operational feedback} to a user 
The user interface 136 may include a display component , such as { HEAD ~ a digital or analog display device } designed to provide { TAIL ~ operational feedback } to a user
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH