{TAIL ~ A single vent} is located between the cells and {HEAD ~ drains} fluid or gas, as the case may be, from the cells 
{ TAIL ~ A single vent } is located between the cells and { HEAD ~ drains } fluid or gas , as the case may be , from the cells
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH