As shown, {HEAD ~ a common first doped region} is provided for {TAIL ~ the first and second transistors} 
As shown , { HEAD ~ a common first doped region } is provided for { TAIL ~ the first and second transistors }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL