said {HEAD ~ hole} is covered with {TAIL ~ a new sealing label} after said re injection of said low density gas 
said { HEAD ~ hole } is covered with { TAIL ~ a new sealing label } after said re injection of said low density gas
OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH