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