{HEAD ~ A filter pack} is disposed within {TAIL ~ the combustion chamber} along an inner diameter of the outer wall 
is disposed within
{ HEAD ~ A filter pack } is disposed within { TAIL ~ the combustion chamber } along an inner diameter of the outer wall
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH