December(12月)

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(dateEstablished WorldCustomsOrganization
    (DayFn 15
        (MonthFn December
            (YearFn 1950))))
Government.kif 3055-3055 dateEstablished WorldCustomsOrganization and 15 day
(equal WinterSeason
    (RecurrentTimeIntervalFn December February))
Geography.kif 1667-1667 WinterSeason は the recurring period from 12月 to 2月equal では %n
(subclass ChristmasDay
    (DayFn 25 December))
Media.kif 337-337 ChristmasDay は 25 day 目 の subclass では %n


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