The method may include providing a reactor having catalytic material in or on {TAIL ~ the inner surfaces} of the first plurality of {HEAD ~ cells} 
The method may include providing a reactor having catalytic material in or on { TAIL ~ the inner surfaces } of the first plurality of { HEAD ~ cells }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD