The output of {HEAD ~ vector adder} 80, labeled RESULT, provides {TAIL ~ a data input} to WT PORT1 
The output of { HEAD ~ vector adder } 80 , labeled RESULT , provides { TAIL ~ a data input } to WT PORT1
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH