said combining element combines the data input signal with {HEAD ~ the output} of {TAIL ~ the feedback element} to produce an output which forms the first input to the selector element, 
of
said combining element combines the data input signal with { HEAD ~ the output } of { TAIL ~ the feedback element } to produce an output which forms the first input to the selector element ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH