{TAIL ~ An electrical insulation} is formed between the first region and the second region of {HEAD ~ the semiconductor layer} 
{ TAIL ~ An electrical insulation } is formed between the first region and the second region of { HEAD ~ the semiconductor layer }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD