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