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  LeapYear

 Sigma KEE - LeapYear

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
闰年
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)。
Relationships      
Parents 年 The Class of all calendar Years.


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