A plate can be used instead of the structure, and {HEAD ~ the plate} is folded to form {TAIL ~ the structure} after the ablation 
is folded to form
A plate can be used instead of the structure , and { HEAD ~ the plate } is folded to form { TAIL ~ the structure } after the ablation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH