| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Cars.kif 5013-5013 | The maker of Peterbilt truck is Peterbilt |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 5012-5012 | Peterbilt truck is a subclass of truck tractor |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Cars.kif 5015-5015 | |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 5014-5014 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners