| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3760-3763 | |
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3758-3758 | Clamshell is a subclass of device |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3765-3765 |
| antecedent |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 3767-3773 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners