The grouping of {HEAD ~ documents} with {TAIL ~ the same fingerprint} facilitates creation of anti spam rules or identification of web pages from particular websites, for example 
with
The grouping of { HEAD ~ documents } with { TAIL ~ the same fingerprint } facilitates creation of anti spam rules or identification of web pages from particular websites , for example
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH