FIG 7 illustrates how {TAIL ~ a codeword} is input into {HEAD ~ an interleaver}, and then output from the interleaver 
FIG 7 illustrates how { TAIL ~ a codeword } is input into { HEAD ~ an interleaver } , and then output from the interleaver
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH