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Term 1: Term 2:

(subclass NonnegativeRealNumber RealNumber) Merge.kif 1921-1921 子類 NonnegativeRealNumber and RealNumber
(subclass PositiveRealNumber NonnegativeRealNumber) Merge.kif 1932-1932 子類 PositiveRealNumber and NonnegativeRealNumber
(subclass NonnegativeInteger NonnegativeRealNumber) Merge.kif 1976-1976 子類 NonnegativeInteger and NonnegativeRealNumber


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