pm#gas_powered_car__gaspoweredcar
  exclusion:  #electric_car  pm#car_with_diesel  pm#car_with_super_petrol  pm#car_with_unleaded_petrol  pm#car_with_leaded_petrol
  supertype:  pm#car_with_a_certain_energy_source
  subtype:  #Stanley_Steamer  (trademark) a steam-powered automobile

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