| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 2775-2776 | |
| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 2774-2774 | Flight reservation is a subclass of reservation |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 2777-2777 |
| consequent |
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| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 2766-2772 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners