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