{HEAD ~ Transistor} 168 has {TAIL ~ its emitter} coupled to low voltage source A via resistor 170, the combination of which forms a current source 
has
{ HEAD ~ Transistor } 168 has { TAIL ~ its emitter } coupled to low voltage source A via resistor 170 , the combination of which forms a current source
HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH