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Sigma KEE - Year
KB Term: 
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Year
The Class of all calendar Years.
Relationships      
Parents TimeInterval An interval of time. Note that a TimeInterval has both an extent and a location on the universal timeline. Note too that a TimeInterval has no gaps, i.e. this class contains only convex time intervals.
Children LeapYearThe Class of all leap years. These are years which are either (i.) evenly divisible by 4 and not by 100 or (ii.) evenly divisible by 400 (this latter case is known as a leap century).


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