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