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