{HEAD ~ An example} of the etch stopping layer 12 includes {TAIL ~ a silicon nitride layer} 
includes
{ HEAD ~ An example } of the etch stopping layer 12 includes { TAIL ~ a silicon nitride layer }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL