Memory 580 includes, among other things, {HEAD ~ selection protocol software} 582 which implements {TAIL ~ a selection protocol} such as those exemplified by selection protocols 200, 300, and 400 when executed in processor 510 
implements
Memory 580 includes , among other things , { HEAD ~ selection protocol software } 582 which implements { TAIL ~ a selection protocol } such as those exemplified by selection protocols 200 , 300 , and 400 when executed in processor 510
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH 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 OTH