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