{HEAD ~ A communications channel} comprises {TAIL ~ a buffer} that receives user data that includes a plurality of m bit symbols 
comprises
{ HEAD ~ A communications channel } comprises { TAIL ~ a buffer } that receives user data that includes a plurality of m bit symbols
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH