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Term 1: Term 2:

(subclass USThanksgivingDay USHoliday) Media.kif 619-619 USThanksgivingDay 是 USHoliday 的 subclass
(subclass USThanksgivingDay MoveableHoliday) Media.kif 620-620 USThanksgivingDay 是 可动的假期 的 subclass
(subclass USThanksgivingDay Thursday) Media.kif 621-621 USThanksgivingDay 是 星期四 的 subclass


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