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  Vacuum
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| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Cars.kif 365-366 | |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 363-363 | Vacuum 是 内在属性 的 instance |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Cars.kif 364-364 |
| antecedent |
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| No TPTP formula. May not be expressible in strict first order. | Cars.kif 368-376 |
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