For video coding, {TAIL ~ the described architecture} uses {HEAD ~ block based comparisons}, e.g., to support for motion estimation and motion compensation 
For video coding , { TAIL ~ the described architecture } uses { HEAD ~ block based comparisons } , e.g. , to support for motion estimation and motion compensation
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH