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