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