In {TAIL ~ another embodiment}, the reference picture is {HEAD ~ a clean reference picture} in a HITS stream 
In { TAIL ~ another embodiment } , the reference picture is { HEAD ~ a clean reference picture } in a HITS stream
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH