{HEAD ~ The message} passing {TAIL ~ decoder} 8, wherein the LDPC codes have a fixed column weight 
passing
{ HEAD ~ The message } passing { TAIL ~ decoder } 8 , wherein the LDPC codes have a fixed column weight
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH