a circuit for decoding the first prediction picture and the second prediction picture from the reference picture and {HEAD ~ a display picture} from {TAIL ~ the first prediction picture} and the second prediction picture 
a circuit for decoding the first prediction picture and the second prediction picture from the reference picture and { HEAD ~ a display picture } from { TAIL ~ the first prediction picture } and the second prediction picture
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH