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