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Relation: subclass

direct-childrendocumentationgraph
Year1这是所有日历 Year 的 Class。^
    LeapYear.这是所有闰年的 Class。这些年份当中，要不是(i.)能被4 却不能被100整除的，或是 (ii.)能被400整除的(后者是为世纪闰年)。^

Relation: Term:

Levels "above": Levels "below": Total term limit: Show instances:
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