{HEAD ~ The apparatus} includes a combustion chamber communicating with an air intake passage and {TAIL ~ an air exhaust passage} 
{ HEAD ~ The apparatus } includes a combustion chamber communicating with an air intake passage and { TAIL ~ an air exhaust passage }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL