The combined low and medium pressure off {HEAD ~ gas stream} is contacted with {TAIL ~ the high pressure liquid} in the high pressure flash zone 
The combined low and medium pressure off { HEAD ~ gas stream } is contacted with { TAIL ~ the high pressure liquid } in the high pressure flash zone
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH