providing fuel, via a fuel conduit, to {HEAD ~ a plurality} of {TAIL ~ 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 fuel , via a fuel conduit , to { HEAD ~ a plurality } of { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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