| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1340-1340 | 字符 是 符号串 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 19466-19466 | 字母字符 是 字符 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 19470-19470 | 数字字符 是 字符 的 subclass |
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