| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 5117-5117 | Lake walker is an instance of salt lake |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 5118-5118 | Lake walker has name "Lake Walker" |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33157-33157 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33156-33156 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33155-33155 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners