The second coding device includes a first divider that separates the scrambled user data into at least one group including {HEAD ~ first and second symbols} each with {TAIL ~ first and second interleaved subsequences} 
The second coding device includes a first divider that separates the scrambled user data into at least one group including { HEAD ~ first and second symbols } each with { TAIL ~ first and second interleaved subsequences }
OTH OTH 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 HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL