A first region is “less significant” than a second region if the bits included in the first region are less significant than {HEAD ~ the bits} in {TAIL ~ the second region} 
A first region is “ less significant ” than a second region if the bits included in the first region are less significant than { HEAD ~ the bits } in { TAIL ~ the second region }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL