The manager computer is further coupled to {HEAD ~ the number} of {TAIL ~ uninterruptible power supply systems} via the computer network 
of
The manager computer is further coupled to { HEAD ~ the number } of { TAIL ~ uninterruptible power supply systems } via the computer network
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH