{HEAD ~ A general methodology} is provided to obtain the multilevel decoders, which is based on reducing failures due to trapping sets and improving {TAIL ~ the guaranteed error correction capability} of a code 
{ HEAD ~ A general methodology } is provided to obtain the multilevel decoders , which is based on reducing failures due to trapping sets and improving { TAIL ~ the guaranteed error correction capability } of a code
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH