{HEAD ~ Each} of the levels of scheduling hierarchy might have {TAIL ~ one or more corresponding mapping tables} in Queue Engine 308 
{ HEAD ~ Each } of the levels of scheduling hierarchy might have { TAIL ~ one or more corresponding mapping tables } in Queue Engine 308
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH