On the other end, {TAIL ~ the output circuit} of the transistor is connected to {HEAD ~ a second reference potential} 
On the other end , { TAIL ~ the output circuit } of the transistor is connected to { HEAD ~ a second reference potential }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD