{TAIL ~ The drain region}, the source/base region, and the cathode region have {HEAD ~ a second conductivity type} 
{ TAIL ~ The drain region } , the source / base region , and the cathode region have { HEAD ~ a second conductivity type }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD