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