In {HEAD ~ this manner}, {TAIL ~ fair arbitration} is assured for other CPUs contending for control of the system bus 
In { HEAD ~ this manner } , { TAIL ~ fair arbitration } is assured for other CPUs contending for control of the system bus
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH