Furthermore, {HEAD ~ the commonly obtained pyrolysis oil} is up graded to a high grade gasoline, rich in mono aromatics and free from undesirable durenes and {TAIL ~ long aliphatic chains} 
Furthermore , { HEAD ~ the commonly obtained pyrolysis oil } is up graded to a high grade gasoline , rich in mono aromatics and free from undesirable durenes and { TAIL ~ long aliphatic chains }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL