{HEAD ~ The last zone} comprises {TAIL ~ a set} of two axially spaced sprayrings located adjacent the outer wall of the afterburner, one spraying being located upstream of the other spraying 
comprises
{ HEAD ~ The last zone } comprises { TAIL ~ a set } of two axially spaced sprayrings located adjacent the outer wall of the afterburner , one spraying being located upstream of the other spraying
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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