{HEAD ~ The nuts act} to stop cracks formed in {TAIL ~ the structure} when the structure is impacted 
{ HEAD ~ The nuts act } to stop cracks formed in { TAIL ~ the structure } when the structure is impacted
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH