Referring to FIG 2 d, {TAIL ~ first and second doped regions} 131, 132 and 133 of {HEAD ~ the first and second transistors} are formed 
Referring to FIG 2 d , { TAIL ~ first and second doped regions } 131 , 132 and 133 of { HEAD ~ the first and second transistors } are formed
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH