{HEAD ~ The output} of {TAIL ~ the latch} 14 also is fed back for input to the adder 12 
of
{ HEAD ~ The output } of { TAIL ~ the latch } 14 also is fed back for input to the adder 12
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH