A system replicates Internet websites on {HEAD ~ a large number} of {TAIL ~ user computers} having browsers 
of
A system replicates Internet websites on { HEAD ~ a large number } of { TAIL ~ user computers } having browsers
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH