{HEAD ~ an inflator housing} having two walls, {TAIL ~ an inner wall} and an outer wall, the inner and outer walls forming a combustion chamber 
having
{ HEAD ~ an inflator housing } having two walls , { TAIL ~ an inner wall } and an outer wall , the inner and outer walls forming a combustion chamber
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH