{HEAD ~ The separation tray} has horizontal upper and lower walls and {TAIL ~ a plurality} of primary separation devices for separating a fluid into a primary gas and a liquid enriched secondary gas 
has
{ HEAD ~ The separation tray } has horizontal upper and lower walls and { TAIL ~ a plurality } of primary separation devices for separating a fluid into a primary gas and a liquid enriched secondary gas
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH