A structure having a normal position, and {HEAD ~ a deformed position} in which {TAIL ~ the structure} is subject to strain resulting from 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: 
A structure having a normal position , and { HEAD ~ a deformed position } in which { TAIL ~ the structure } is subject to strain resulting from 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH