{HEAD ~ The first and second stages} of {TAIL ~ the compressor} are used to provide the combined compressed low and medium pressure off gas stream 
of
{ HEAD ~ The first and second stages } of { TAIL ~ the compressor } are used to provide the combined compressed low and medium pressure off gas stream
HEAD HEAD 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