A structure having a normal position, and a deformed position in which the structure is subject to {HEAD ~ strain} resulting from {TAIL ~ external application} of stress forces, the structure being adapted to respond to the strain induced by the external stress forces and to restore itself to the normal position, the structure comprising: 
resulting from
A structure having a normal position , and a deformed position in which the structure is subject to { HEAD ~ strain } resulting from { TAIL ~ external application } of stress forces , the structure being adapted to respond to the strain induced by the external stress forces and to restore itself to the normal position , the structure comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH