The pointer value changes over {HEAD ~ a period} are labeled {TAIL ~ Extra Long Mega Frame} which consists of n Mega Frames 
The pointer value changes over { HEAD ~ a period } are labeled { TAIL ~ Extra Long Mega Frame } which consists of n Mega Frames
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH