at least one additional transistor having two output terminals coupling between {TAIL ~ an additional input node} and {HEAD ~ the intermediate node} 
at least one additional transistor having two output terminals coupling between { TAIL ~ an additional input node } and { HEAD ~ the intermediate node }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD