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Term 1: Term 2:

(=>
    (and
        (equal ?W
            (OrganicObjectFn ?S))
        (subclass ?W BirchWood)
        (subclass ?S PlantStem))
    (initialPart ?S BirchTree))		 Economy.kif 5316-5321
(subclass BirchTree DeciduousTree) Geography.kif 6489-6489 BirchTree 是 DeciduousTree 的 subclass


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