{TAIL ~ The method} 2, wherein removing the portion of {HEAD ~ the shared region} includes etching the shared region 
{ TAIL ~ The method } 2 , wherein removing the portion of { HEAD ~ the shared region } includes etching the shared region
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH