| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Communications.kif 247-249 | |
| No TPTP formula. May not be expressible in strict first order. | Communications.kif 246-246 | Shortwave radio system is a subclass of radio system |
| appearance as argument number 2 |
|
|
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 52851-52851 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 52850-52850 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 52849-52849 |
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