{TAIL ~ The user affinity groups} may be formed by comparing {HEAD ~ user profiles} with each other or with a predefined affinity group profile definition 
{ TAIL ~ The user affinity groups } may be formed by comparing { HEAD ~ user profiles } with each other or with a predefined affinity group profile definition
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH