The base of electrodes of transistors Q1 and Q2 are fed {HEAD ~ a controller} 14 via {TAIL ~ lines} 15, 13, respectively as shown 
via
The base of electrodes of transistors Q1 and Q2 are fed { HEAD ~ a controller } 14 via { TAIL ~ lines } 15 , 13 , respectively as shown
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH