| (=> (and (instance ?SKI SnowSki) (material ?MAT ?SKI)) (or (subclass ?MAT Metal) (subclass ?MAT Wood) (subclass ?MAT Plastic))) |
Sports.kif 1041-1048 | |
| (subclass Plastic Hydrocarbon) | Mid-level-ontology.kif 9194-9194 | |
| (subclass SyntheticWicker Plastic) | Mid-level-ontology.kif 4601-4601 | |
| (subclass Polypropylene Plastic) | Mid-level-ontology.kif 9201-9201 | |
| (subclass Polystyrene Plastic) | Mid-level-ontology.kif 9208-9208 |
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