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No TPTP formula. May not be expressible in strict first order. Merge.kif 1975-1975 子類 NonnegativeInteger and Integer
No TPTP formula. May not be expressible in strict first order. Merge.kif 1976-1976 子類 NonnegativeInteger and NonnegativeRealNumber
No TPTP formula. May not be expressible in strict first order. Merge.kif 1994-1994 子類 PositiveInteger and NonnegativeInteger


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