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