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