One aspect of the invention provides {HEAD ~ an igniter} for igniting {TAIL ~ a fuel air mixture} in a combustion chamber 
for igniting
One aspect of the invention provides { HEAD ~ an igniter } for igniting { TAIL ~ a fuel air mixture } in a combustion chamber
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH