{TAIL ~ Each module} has a housing divided by {HEAD ~ walls} into a transfer chamber at one end and a second chamber at the other end 
{ TAIL ~ Each module } has a housing divided by { HEAD ~ walls } into a transfer chamber at one end and a second chamber at the other end
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH