{HEAD ~ An ordered packing} for mass transfer and heat exchange processes includes {TAIL ~ pre formed individual parts} 
includes
{ HEAD ~ An ordered packing } for mass transfer and heat exchange processes includes { TAIL ~ pre formed individual parts }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL