such that decoding the second coded portion relies on {TAIL ~ an output} from decoding {HEAD ~ the first coded portion}; and 
such that decoding the second coded portion relies on { TAIL ~ an output } from decoding { HEAD ~ the first coded portion } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH