{HEAD ~ The polygonal rib structure} 12, wherein said polygonal rib structure is {TAIL ~ a shock absorbing member} 
{ HEAD ~ The polygonal rib structure } 12 , wherein said polygonal rib structure is { TAIL ~ a shock absorbing member }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL