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No TPTP formula. May not be expressible in strict first order. Cars.kif 582-582 Wearing friction surface is a subclass of device
No TPTP formula. May not be expressible in strict first order. Cars.kif 596-596 Brake shoe is a subclass of wearing friction surface
No TPTP formula. May not be expressible in strict first order. Cars.kif 658-658 Brake pad is a subclass of wearing friction surface


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