{HEAD ~ The heuristics} 530 may advantageously address {TAIL ~ circumstances} surrounding an authentication attempt, such as, for example, the time of day, IP address or subnet mask, purchasing profile, email address, processor serial number or ID, or the like 
{ HEAD ~ The heuristics } 530 may advantageously address { TAIL ~ circumstances } surrounding an authentication attempt , such as , for example , the time of day , IP address or subnet mask , purchasing profile , email address , processor serial number or ID , or the like
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH