{TAIL ~ An internal combustion engine} is provided having a pair of cylinders interconnected by {HEAD ~ means} of a narrow connecting channel 
{ TAIL ~ An internal combustion engine } is provided having a pair of cylinders interconnected by { HEAD ~ means } of a narrow connecting channel
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH