[['year', 'entrant', 'chassis', 'engine', 'points'], ['1951', 'scuderia milano', 'maserati 4clt / 48', 'maserati straight - 4', '0'], ['1954', 'officine alfieri maserati', 'maserati 250f', 'maserati straight - 6', '0'], ['1956', 'officine alfieri maserati', 'maserati 250f', 'maserati straight - 6', '6'], ['1957', 'francesco godia sales', 'maserati 250f', 'maserati straight - 6', '0'], ['1958', 'francesco godia sales', 'maserati 250f', 'maserati straight - 6', '0']]
the Maserati 250f Chassis was used every Year except 1951
the [ENT] [ENT] was used every [ENT] except [ENT]