For {HEAD ~ fully populated levels} of {TAIL ~ hierarchy}, a new queue might typically be inserted to the scheduling hierarchy at the lowest level  
of
For { HEAD ~ fully populated levels } of { TAIL ~ hierarchy } , a new queue might typically be inserted to the scheduling hierarchy at the lowest level
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH