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Term 1: Term 2:

(subclass LowlandArea LandForm) Geography.kif 3984-3984 低地地区 是 土地形式 的 subclass
(subclass Plain LowlandArea) Geography.kif 4218-4218 朴素 是 低地地区 的 subclass
(subclass Valley LowlandArea) Geography.kif 4227-4227 谷 是 低地地区 的 subclass


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