The pictures in {HEAD ~ an EP—EP segment} are decoded by decoding and storing {TAIL ~ the clean reference picture} immediately preceding the EP to EP segment in the forward order 
The pictures in { HEAD ~ an EP — EP segment } are decoded by decoding and storing { TAIL ~ the clean reference picture } immediately preceding the EP to EP segment in the forward order
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH