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Term 1: Term 2:

(subclass NonnegativeInteger Integer) Merge.kif 1986-1986 Nonnegative integer is a subclass of integer
(subclass NonnegativeInteger NonnegativeRealNumber) Merge.kif 1987-1987 Nonnegative integer is a subclass of nonnegative real number
(subclass PositiveInteger NonnegativeInteger) Merge.kif 2005-2005 Positive integer is a subclass of nonnegative integer


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