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