| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 90-90 | PhoneOS 是 操作系统 的 subclass |
| appearance as argument number 2 |
|
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 28-28 | Android 是 PhoneOS 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 84-84 | 苹果作业系统 是 PhoneOS 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 65307-65307 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners