The center region 34 is {TAIL ~ the shared diffusion region} of the cascode connected transistors of {HEAD ~ the present invention} 
The center region 34 is { TAIL ~ the shared diffusion region } of the cascode connected transistors of { HEAD ~ the present invention }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD