The system includes {TAIL ~ an uninterruptible power supply manager computer} coupled to a number of user computers via {HEAD ~ a computer network} 
The system includes { TAIL ~ an uninterruptible power supply manager computer } coupled to a number of user computers via { HEAD ~ a computer network }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD