The list of {HEAD ~ requester identifiers} in {TAIL ~ each priority vector} may be advantageously programmable 
The list of { HEAD ~ requester identifiers } in { TAIL ~ each priority vector } may be advantageously programmable
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH