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