{TAIL ~ An exhaust channel} is defined in the base portion and communicating with {HEAD ~ the at least one membrane electrode assembly} 
{ TAIL ~ An exhaust channel } is defined in the base portion and communicating with { HEAD ~ the at least one membrane electrode assembly }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD