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Term 1: Term 2:

(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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