{TAIL ~ The mask} generated from the most significant bits section of the pointer includes bits corresponding to {HEAD ~ various regions} of the output mask 
{ TAIL ~ The mask } generated from the most significant bits section of the pointer includes bits corresponding to { HEAD ~ various regions } of the output mask
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH