| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3777-3780 | |
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3775-3775 | Keyboard is a subclass of device |
| appearance as argument number 2 |
|
|
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3782-3782 |
| antecedent |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3784-3790 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners