Exemplary embodiments of the invention relate to {HEAD ~ a method} for producing {TAIL ~ a protective structure}, and the protective structure 
for producing
Exemplary embodiments of the invention relate to { HEAD ~ a method } for producing { TAIL ~ a protective structure } , and the protective structure
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH