so that {TAIL ~ the input} to {HEAD ~ said feedback element} is either the data input signal or a combination thereof with the output of the feedback element, as determined by said control signal 
so that { TAIL ~ the input } to { HEAD ~ said feedback element } is either the data input signal or a combination thereof with the output of the feedback element , as determined by said control signal
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH 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 OTH OTH OTH OTH