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No TPTP formula. May not be expressible in strict first order. Languages.kif 12471-12471 东苏丹语 是 nilo撒哈拉语言 的 subclass
No TPTP formula. May not be expressible in strict first order. Languages.kif 12477-12477 西苏丹语 是 东苏丹语 的 subclass


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