| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 30894-30894 | ClimbingRope 是 Rope 的 subclass |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 30898-30898 |
| consequent |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 30839-30850 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners