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   Reef
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| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Communications.kif 334-335 | |
| No TPTP formula. May not be expressible in strict first order. | Communications.kif 333-333 | Cable television system is a subclass of communication system |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12607-12607 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12606-12606 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12605-12605 |
| antecedent |
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| No TPTP formula. May not be expressible in strict first order. | Communications.kif 337-342 |
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