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No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 8822-8822 Surfactant is a subclass of substance
No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 8831-8831 Detergent is a subclass of surfactant
No TPTP formula. May not be expressible in strict first order. Economy.kif 5965-5965 Soap is a subclass of surfactant


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