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