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