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