| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 1863-1864 | |
| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 1861-1861 | Ironing service is a subclass of service |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 1865-1865 |
| antecedent |
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| No TPTP formula. May not be expressible in strict first order. | Hotel.kif 1867-1874 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners