The queue has a corresponding scheduler level M, where {HEAD ~ M} is {TAIL ~ a positive integer} less than or equal to N 
The queue has a corresponding scheduler level M , where { HEAD ~ M } is { TAIL ~ a positive integer } less than or equal to N
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH