{TAIL ~ The circuit} contains {HEAD ~ a quadritail circuit} formed of first, second, third and fourth transistors whose emitters or sources are coupled together 
{ TAIL ~ The circuit } contains { HEAD ~ a quadritail circuit } formed of first , second , third and fourth transistors whose emitters or sources are coupled together
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH