{TAIL ~ One specific example} is the sweetening of kerosene which involves oxidizing the mercaptans contained in {HEAD ~ the kerosene} 
{ TAIL ~ One specific example } is the sweetening of kerosene which involves oxidizing the mercaptans contained in { HEAD ~ the kerosene }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD