{HEAD ~ The first feedback mode} is not {TAIL ~ a self correcting mode} since errors in the output bit state from the sampling stage or from the feedback stage are not corrected 
{ HEAD ~ The first feedback mode } is not { TAIL ~ a self correcting mode } since errors in the output bit state from the sampling stage or from the feedback stage are not corrected
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH