No TPTP formula. May not be expressible in strict first order. | Cars.kif 4359-4359 | Helmet is a subclass of safety device |
No TPTP formula. May not be expressible in strict first order. | Cars.kif 4360-4360 | Helmet is a subclass of a covering for head |
No TPTP formula. May not be expressible in strict first order. | Cars.kif 4364-4364 | Motorcycle helmet is a subclass of helmet |