The online web site analysis tool processes web site metric data that is already stored for a population of {TAIL ~ web sites} as a result of {HEAD ~ search engine operations} 
The online web site analysis tool processes web site metric data that is already stored for a population of { TAIL ~ web sites } as a result of { HEAD ~ search engine operations }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD