Generally, {HEAD ~ said fuel cell} is a net producer of water, and said fuel processor 12 is a net consumer of {TAIL ~ water} 
Generally , { HEAD ~ said fuel cell } is a net producer of water , and said fuel processor 12 is a net consumer of { TAIL ~ water }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL