No TPTP formula. May not be expressible in strict first order. | Cars.kif 4367-4367 | Helmet is a subclass of safety device |
No TPTP formula. May not be expressible in strict first order. | Cars.kif 4368-4368 | Helmet is a subclass of a covering for head |
No TPTP formula. May not be expressible in strict first order. | Cars.kif 4372-4372 | Motorcycle helmet is a subclass of helmet |