{HEAD ~ A method} for driving {TAIL ~ a vehicle} driven by an internal combustion engine having a plurality of compression chambers divided into a first set and a second set, each of said sets being able to be separately operated and to be convertible in operation so as to take an compression action 
for driving
{ HEAD ~ A method } for driving { TAIL ~ a vehicle } driven by an internal combustion engine having a plurality of compression chambers divided into a first set and a second set , each of said sets being able to be separately operated and to be convertible in operation so as to take an compression action
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