providing {HEAD ~ fuel}, via a fuel conduit, to {TAIL ~ a plurality} of oxidizers coupled in series in an opening in the formation, wherein an oxidizer that first receives fuel from the fuel conduit is a first oxidizer 
providing { HEAD ~ fuel } , via a fuel conduit , to { TAIL ~ a plurality } of oxidizers coupled in series in an opening in the formation , wherein an oxidizer that first receives fuel from the fuel conduit is a first oxidizer
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH