A method for driving a vehicle driven by an internal combustion engine having a plurality of {HEAD ~ compression chambers} divided into a first set and {TAIL ~ 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 
divided into
A method for driving a vehicle driven by an internal combustion engine having a plurality of { HEAD ~ compression chambers } divided into a first set and { TAIL ~ 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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