In a manner similar to identifying more significant and less significant bits, {HEAD ~ regions} in {TAIL ~ the output mask} may be viewed as more significant or less significant 
in
In a manner similar to identifying more significant and less significant bits , { HEAD ~ regions } in { TAIL ~ the output mask } may be viewed as more significant or less significant
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH