{HEAD ~ A method} for driving a vehicle driven by {TAIL ~ 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 
{ HEAD ~ A method } for driving a vehicle driven by { TAIL ~ 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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