{HEAD ~ The reactor} is either a catalytic or non catalytic burner, or {TAIL ~ a fuel reformer} for converting a fuel to hydrogen 
is
{ HEAD ~ The reactor } is either a catalytic or non catalytic burner , or { TAIL ~ a fuel reformer } for converting a fuel to hydrogen
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH