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