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