A second transistor couples at least one logic input of the logic circuit to {HEAD ~ the input} of {TAIL ~ the amplifier} 
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A second transistor couples at least one logic input of the logic circuit to { HEAD ~ the input } of { TAIL ~ the amplifier }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL