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