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