{TAIL ~ The first wall} is located near {HEAD ~ the combustion chamber} and flexes in response to varying combustion chamber pressure 
{ TAIL ~ The first wall } is located near { HEAD ~ the combustion chamber } and flexes in response to varying combustion chamber pressure
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH