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RationalNumber7这是把两个 Integer 相除的商，它可以是任何一个的 RealNumber。^
    Integer6这是一个负或非负的整数。^
        EvenInteger.这是一个可以被2整除的 Integer。^
        OddInteger.这是一个不能被2整除的 Integer。^
        PrimeNumber.这是一个只能被自己或1整除的 Integer。^
        NonnegativeInteger1这是一个大于或等于零的 Integer。^
        NegativeInteger.这是一个小于零的 Integer 。^

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