{HEAD ~ A separation tray}, suitable for mounting in a vertical column, for separating {TAIL ~ liquid/gas mixtures} 
suitable for separating
{ HEAD ~ A separation tray } , suitable for mounting in a vertical column , for separating { TAIL ~ liquid / gas mixtures }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL