(subclass Fuel Substance) | Mid-level-ontology.kif 2156-2156 | Fuel is a subclass of substance |
(subclass FossilFuel Fuel) | Mid-level-ontology.kif 2150-2150 | Fossil fuel is a subclass of fuel |
(subclass Charcoal Fuel) | Cars.kif 1677-1677 | Charcoal is a subclass of fuel |
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