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