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No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 1693-1693 Fuel is a subclass of substance
No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 1687-1687 Fossil fuel is a subclass of fuel
No TPTP formula. May not be expressible in strict first order. Cars.kif 1670-1670 Charcoal is a subclass of fuel


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