{HEAD ~ A first portion} of heavy oil or another feedstock can be deasphalted using {TAIL ~ propane deasphalting} or another suitable deasphalting process 
{ HEAD ~ A first portion } of heavy oil or another feedstock can be deasphalted using { TAIL ~ propane deasphalting } or another suitable deasphalting process
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH